My cynical take is that Facebook wants the money from ads target at children, but not the responsibility of vetting the apps they might download because the trust the platform they are in. Google and Apple just want to pass the responsibility to developers and create laws that punish them for misusing tools they want to provide so other people deal with the complaints.

Still being cynical. It’s not that big corporations can’t do anything. They just can’t do anything without using their own money.