California hasn't "weighed it". It's doing the same thing as Britain, Australia, the European Union etc.

Obviously some people have signed some agreement somewhere or they all came up with this round about the same time by coincidence.

I believe it is largely Meta pushing this so they can more accurately track people over 16.

Certainly one of the interest groups pushing for this (as it makes their data harvesting more valuable)... But I think it ties into long range Fourth Industrial Revolution goals such as CBDC and digital ID in its later forms.