I feel strongly that this conspiratorial mind-reading approach to this sort of issue is just counterproductive.
What all the governments (and non-governments, frankly, there are many supporters of these things) are asking for is excluding minors from certain websites and services.
The problem is that this translates to age verification, which translates to identify verification, which incidentally gives states and other actors a variety of other tools they can use for anti-civil-liberties purposes.
In the end their motives are just irrelevant unless there is a clear way to exclude minors from certain services without going down the chain towards identity verification. Such a way does not exist, so we have to fight it here, at the point where the basic ask emerges.