The Kids Online Safety Act (KOSA) would require covered online services to reduce foreseeable harms to children and teens through product design, default settings and risk management. Organisations would need to assess features that encourage harmful behaviour, limit excessive data collection, and provide stronger privacy and safety controls, with evidence that those controls are actually enforced.
What KOSA changes for product design and default settings
KOSA is not a content takedown rule. It pushes covered services to change how products are built and tuned so that foreseeable harm to minors is reduced by design, not just reported after the fact. That means the practical focus is on defaults, recommendation surfaces, privacy settings, discovery features, and any mechanism that can intensify risky behaviour or exposure.
For practitioners, the important shift is that safety is treated as a design and operations requirement. A service may need to justify why a feature is enabled by default, why a recommendation path is allowed to amplify harmful content, or why a data collection practice is necessary for the child-facing experience it provides.
That logic aligns with the broader idea of privacy and safety by default, and it is one reason age assurance and child protection engineering become relevant implementation topics. NHIMG’s Age Verification and Age Assurance Guide is useful here because KOSA-style obligations often depend on knowing when a user is a child or teen well enough to apply the right controls.
What services need to assess and enforce
KOSA-style compliance depends on more than a policy document. Covered organisations would need a risk assessment process that examines product features likely to encourage self-harm, eating disorders, addictive use, sexual exploitation, bullying, or other foreseeable harms to children and teens. The point is to identify where product behaviour can be harmful even when the underlying content is not illegal.
That assessment should feed concrete controls: limit excessive data collection, reduce intrusive profiling, tighten default privacy, and make safety settings meaningfully enforceable rather than optional or hidden. If the product relies on personalization, the service should be able to show how the recommendation or ranking logic is bounded when the user is a minor.
This is also where accountability matters. Teams should be able to trace a control from policy to implementation to evidence of operation, because a paper safeguard that is not actually enforced will not satisfy the practical intent of the law.
What KOSA means for engineering, privacy, and evidence
In practice, KOSA pushes child safety into product governance, privacy engineering, trust and safety operations, and legal review at the same time. Engineering teams need to know which features are in scope, privacy teams need to know what data minimisation looks like for minors, and risk owners need to know which metrics demonstrate that the protections are actually active.
Current guidance suggests that the hard part is not drafting a policy, but proving that the policy is embedded in the system. For example, if a child-facing control is easy to bypass, not consistently applied across devices, or undermined by profile inheritance, the service may have the right language but the wrong operating posture.
Where KOSA intersects with broader cybersecurity practice is in governance, access control, logging, and change management. If a team changes ranking, messaging, or privacy defaults, it should treat that as a safety-relevant release and be able to explain the expected impact before and after deployment.
Risk and Threat Considerations
Children’s platforms are exposed to both compliance risk and direct user harm if safety controls are weak, inconsistently enforced, or easy to circumvent. The main failure mode is that a service claims to be protective while the product still amplifies harmful material, collects more data than needed, or leaves minors with settings that are nominally available but practically ineffective.
Failure mechanism: Harm emerges when product design, recommendation logic, or default settings continue to optimise engagement or data capture without a compensating safety layer for minors. Attackers, manipulators, or simply unsafe product behaviour can then exploit the same trust paths that ordinary users rely on.
Impact: The result can be increased exposure to harmful content or contact, weaker privacy protection, and a gap between legal obligation and operational reality. For a covered service, that can also create enforcement exposure if the organisation cannot evidence that controls are actually working.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-53 Rev 5 and NIST CSF 2.0 set the technical controls, while ISO/IEC 27001:2022 and GDPR define the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | RA-3 — Risk Assessment | KOSA requires assessing foreseeable harms and product risks to minors. |
| AC-6 — Least Privilege | Safer defaults and tighter access reduce unnecessary exposure of minor users' data and settings. | |
| Recommendation — Assess product features and user flows for child-safety risk before release. Limit access to sensitive child data and safety settings to approved roles only. | ||
| ISO/IEC 27001:2022 | A.5.15 — Access control | KOSA implementation depends on controlling who can change defaults, data collection, and safety controls. |
| Recommendation — Restrict who can modify child-safety settings, ranking logic, and data collection rules. | ||
| GDPR | Article 25 — Data protection by design and by default | KOSA's design and default-setting requirements closely align with privacy and safety by default. |
| Recommendation — Build child-safety and data-minimisation controls into the product by default. | ||
| NIST CSF 2.0 | GV.RM-01 — Risk management strategy | The law requires governance over foreseeable harms and operational enforcement. |
| Recommendation — Embed child-safety risk into the organisation's governed risk strategy. | ||
Practitioner Guidance
What to prioritise: Start with the highest-risk product paths, recommendation loops, messaging surfaces, default privacy settings, and data collection flows that affect minors. Those are usually the places where foreseeable harm is most likely to be created or amplified.
What to verify: Confirm that safety controls are enforced in the live product, not just documented. Verify that the control remains effective across account types, devices, and feature updates, because a single bypass can undermine the entire compliance story.
Common mistake: Treating KOSA as a legal-text exercise instead of a product-control exercise. If the release process cannot show who approved a safety change, what was tested, and how the outcome was measured, the organisation will struggle to defend the control in practice.
Practitioner takeaway: The strongest posture is to treat child safety as an operating property of the service, not a policy overlay, and to prove with evidence that the product behaves safely under real-world use.