When they started doing this ID verification early this year, I expressed outrage on here, and was met by comments downplaying it saying "It's a given that soon the others will follow". I'm sure some of those came from people at OpenAI.

We're now at the end of the year and neither Google nor Anthropic nor any single other LLM provider does this. OpenAI does this because their CEO is SamA. That's it.