Yes, to uniq7 and others -- you keep saying "identity verification will be used for nefarious purposes". Lets take the alcohol and tobacco case, was it used for nefarious purposes? Did adults suddenly lose rights and/or have something bad happen to them?

The government can and does already track whatever they want about you. Businesses already track you unless you are extremely thorough about erasing your footprint. Adding a zero-knowledge proof through a trusted system that you are 18+ doesn't seem like the mountain people are claiming. You already have to provide ID and credit card to get ISP access, the byte patterns are traced back to your household. They already have a unique fingerprint on your browser and computer. The real harm is just the obvious encroachment that we can all see and have known about since early 2000s. They don't need a "backdoor", it feels like alarmism over a possible problem, when there is a very real harm to children and teens (suicide rates, depression, bullying, mental health, etc).

to go back to smoking / alcohol / guns, one could argue it is an infringement, but ultimately it does seem to have been the right choice for society at large, and the increased "invasion of privacy" has been pretty minor. If anything, the opt-in stuff like credit cards, cell phones, GPS, car apps, streaming services have all been far larger invasions of privacy that people willingly embrace.

Age verification for alcohol/tobacco doesn't require full identification nor keeps any records that can be later used for tracking people for other perverse purposes.

Also, the fact that gov and companies are already tracking people doesn't mean we should consent to more ways of tracking.