"Online age verification"?

You need to know this.

https://web.archive.org/web/20260313090844/https://www.reddit.com/r/linux/comments/1rshc1f/i_traced_2_billion_in_nonprofit_grants_and_45/

tl,dr: ALL of the online age verification bills being presented in multiple states right now were written by Meta, which spent huge amounts of money to get them before legislatures, and they create a pervasive #surveillance layer within the operating system which allows anything running on your computer to query the age bracket of whoever is using the computer at any time, for any reason.

Compare this to what the EU built. The EU Digital Identity Wallet under eIDAS 2.0 is open-source, self-hostable, and uses zero-knowledge proofs. You can prove you're over 18 without revealing your birth date, your name, or anything else. No per-check fees, no proprietary SDKs, no data going to a vendor's cloud. The EU's Digital Services Act puts age verification obligations on Very Large Online Platforms (45M+ monthly users), not on operating systems. FOSS projects that don't act as intermediary services are explicitly outside scope. Micro and small enterprises get additional exemptions.
The original report to r/linux was suppressed by astroturfing, also apparently by Meta, around 40 minutes after it was posted. The Digital Childhood Alliance that supposedly backs these bills doesn't legally exist. It's not registered anywhere and doesn't have an EIN.