Not trying to completely negate the worries over government overreach and spying, but it seems that Meta are biggest ones lobbying for these bills. The biggest push for this are from the likes of Facebook and their banal desire to avoid liability for things like collecting ad data on underage users or kids seeing porn by pushing it onto places like app stores and OS publishers. Plus it probably makes it easier to collect data on users without the liability even if there's nothing stopping you from lying about your age, since most normalfags would probably just enter their actual data of birth into the machine.