Yeah it does seem to be a new 'thing'. I'm betting it's like the heritage foundation who figured out age-restrictions give them a new end-run around the first amendment. Started with porn (because who is going to defend porn) and now they're going to slide down the slippery slope.
From Project 2025[0], published by the Heritage Foundation:
Pornography should be outlawed. The people who produce and distribute it
should be imprisoned. Educators and public librarians who purvey it should be
classed as registered sex offenders.
Don't underestimate the grassroots popularity of these measures. Look at any Hacker News thread regarding age verification and you will find a lot of comments coming out in support of age verification. Most of them are assuming that age verification is something that will only apply to sites they don't use like Facebook.
There are a couple parallel moral panics intersecting on this topic. Again even on HN you'll find people parroting dodgy statistics about child trafficking on social media, proclaiming that short form video is equivalent to highly addictive drugs, or making sweeping claims that under-18s should be banned from having smart phones. It's apparent none of them ever considered that the age restrictions they've been inviting might apply to something they use. It's always assumed to apply only to the kids on the TikTok or something.
https://news.ycombinator.com/item?id=47530718
Here is some more breakdown
https://x.com/moo9000/status/2037184457069760717?s=20