It's easy to lie to an OS about your age because it's a single-user experience, and if your parents allow you to lie (or don't know), that's all it takes. Social networks are so much better equipped to estimate age because they have a simple double-check, which is that most kids follow other kids in their grade level.

The patches on top of this are really bad. For instance, we are seeing "AI" biometric video detectors with a margin-of-error of 5-7 years (meaning the validation studies say when the AI says you're 23-25 you can be considered 18+), totally inadequate to do the job this new legislation demands.