It'll definitely save the criminals.

Selling drugs on the Internet is also illegal. Selling them in real life too. How many people are doing it still? Doesn't seem very effective, this solution.

They will once they catch you doing it, yes. The people who this _won't_ stop however, are criminals.

Seeing that carve out for Google with non-licensed androids being banned from the age verification app., it looks like there's going to be a heavy swing towards trusted devices and apps. in general. Perhaps untrusted ones will be blocked from carrier networks. And then what? You'll be able to have phones with your own custom apps/chat installed that's useless, or phones that are useful but you're stuck with only official, compromised apps.