When thinking about verifying your identity with a service, you have to ask yourself "what will be the impact to me if everything this service knows about me, every click I've made, everything I've watched/read/uploaded is posted publicly on the internet, attached to my full name, address and photo?". Because those are the very real stakes; if you verify with enough services, this will happen to you.

Weigh that against the value of using the service. A lot of times that will still probably come out in favor of using the service. Sometimes, especially given the kind of services that want age verification, the potential cost is such that you would be insane to verify.

Price discrimination comes to mind. What else?

(“what will be the impact to me”)