Stop with the scaremongering.
This is a reference app implementation that uses a detailed framework which explicitly has as a core tenet double blindness. The place you prove your age to has no idea about anything other than you being of age, and the thing you use to prove your age has no idea about where you're using that proof.
If you trust mega corps and the government when they say they're not accessing and monitoring your personal info, then I think that's very interesting.