The main thing COPPA failed at was that iirc the parent who wanted to allow their child on the platform would have to physically email their approval to the operator of the site in question.
Nobody wanted to make their address accessible/wanted to pass the hordes of physical mail that would end up at that address (see the inherent issues with any public email address and spam), so this quickly fell to the wayside in favor of the pinky promise you're above 13 checkbox.
For what it counts, outside the US, minimum age for this sorta thing (although there it's more about general data processing, not some weird "think of the children" nonsense) is often higher.
Here for example you're not allowed to have a Google account if you're >=16 years old, end of story. Still skippable with a checkbox (and from what I know any teenager just does that), but the age being at 13 is not at all a standard.
Nobody wanted to make their address accessible/wanted to pass the hordes of physical mail that would end up at that address (see the inherent issues with any public email address and spam), so this quickly fell to the wayside in favor of the pinky promise you're above 13 checkbox.
For what it counts, outside the US, minimum age for this sorta thing (although there it's more about general data processing, not some weird "think of the children" nonsense) is often higher.
Here for example you're not allowed to have a Google account if you're >=16 years old, end of story. Still skippable with a checkbox (and from what I know any teenager just does that), but the age being at 13 is not at all a standard.