5 years old is crazy, but by the time they are 15-16 it becomes difficult to restrict them from things their peers all do. There needs to be a wider push from all parents or more of a consensus from society that these platforms are dangerous.
Yes, the platforms need to be regulated more for minors.
But also, prohibition has never been a very effective method with teens.
Just look at how college kids drink when they get to college. The sudden removal of parental restriction has a lot to do with that if you ask me.
I think this is better approached with broad education, and stronger regulations on the platforms themselves.
Part of the problem is that many parents aren’t educated themselves about what is good and bad for their kids. Examples include things like nutrition, screen time, even simple stuff like when to wean from bottles and keeping suffocation risks out of cribs.
You're not going to achieve coordinated, collective action by placing the burden of acting on the individual. It never works.
If collective action has to happen to solve some problem, it needs to either 1. be so strongly incentivized such that it's the only sensible thing for individuals to do, or 2. be mandated top-down and enforced.
You can't just shout "My solution relies on everyone independently doing X!" It never works.