Facebook. There's a wave of child endangerment lawsuits incoming and they want to head that off at the pass by having governments shift all that liability over to the OS vendors.
How does that help Facebook? They already have plenty of signals to guess their users' age, what would they do with an other one? They are not going to ban children anyway.
Microsoft just force-updated my operating system (despite declining every option and prompt) and the first thing I noticed working differently was it offering, in an OS popup, to "connect" the computer to "Facebook".
These people have root access to all our webcams.
I don't think we can tolerate these entities to continue to exist.