If you have not seen it yet, please check out this (devastating) security and privacy review of the European Age Verification app. The app is well-intended, but its implementation is deeply flawed.

At the end of the review there is a comparison with the Yivi app, which does things right, see:

https://docs.yivi.app/blog/eu-age-verification-security-analysis#the-architectural-difference

Useful information for decision makers with ambitions about age verification for social media, e.g. in NL: @stasdigi