I think it's likely just to result in offshoring of site, which is a net negative, imo, for constructive regulation of these sites. I think the effort for age verification is going to turn back the clock on progress that has been made in content moderation done by the bigger sites in the US, by pushing eyeballs to less regulated sites overall.
No anonymity on social media sites. Not saying that's desirable - but it's the logical conclusion. You can run your own site anonymously.
> how do you do this in a framework that works globally
Lots of things work globally but are subject to local laws.