The US has had a pretty loose law around the age of 13 for quite some time now. In fact, Google is actually pretty unforgiving about it. For example, if a student uses their school account to sign up for a service they they aren't old enough for Google totally locks their account down. Even the top level domain admins aren't able to open it back up. I have several colleagues who have had to totally create new accounts for the students because they lied about their age or got theirs locked.
Yeah, it shouldn't be "too hard" to make it age-proof for the majority, but there are always workarounds. I am more interested in what people do after they lose access.
They probably just create a new account. Rinse and repeat.
the revenue earning approach will likely create automatic fines if discovered. Some AI tool, like they use for speeding, or not wearing a seatbelt.