> plus they get to point the finger at someone else for age issues.

This is the real benefit to Meta/FB/etc. that many seem to overlook. Meta/FB/etc. are already staring down a lot of court cases related to "addicting youngsters" to their product (and potentially a lot [i.e. billions of dollars] of payout for settlements or penalties in cases that side against them).

But, if they can get the government to mandate that the operating system is responsible for verifying a user's age, they get to avoid liability (i.e., more billions of dollars) for serving anything from their properties to an underage user if the OS tells them that the user is "old enough" for whatever they served. So long as Meta follows the law and asks the OS "is this user old enough" and if the OS replies "old enough" then the liability for mistakes in the age identification shifts to the OS provider and away from Meta/etc.

The part that is odd here is why Microsoft, Apple and Google (the "OS providers" truly being targeted) are not massively lobbying against this due to the legal liability risk that Meta is trying to shift over to them.