Facial modeling has been good enough for porn.

I'd be surprised if the law requires much beyond a vague best effort from service providers, but many already block connections from known server hosts and some even VPNs.

An airtight block is not what's required; stopping social media being mainstream for kids is.

Lol, no. Face scans are being bypassed using video games. Meanwhile the data has shown 90%+ porn users are unwilling to do them and switch sites instead (citation: https://pornbiz.com/post/17/the_scam_of_age_verification ). The whole thing has been a complete fiasco in porn.