What if I could purchase a unique QR code, good for maybe a month, that I could use online to prove my age?
There'd still be problems in the US with 1st amendment issues, but I'd at least remain anonymous.
What many people do have a problem with is requiring disclosure of unmodifiable biometric data and government documents that once "hacked"/sold into the data collection pipeline becomes forever tainted and easily stolen.
You can't "reset my password" with biometric data once a malicious actor has it