>However if OpenAI start trying to make money off those users by adding advertising, or removing the free tier, then things may change.
Tech forums tend to be in a bit of a bubble. People said the same thing about Netflix and it just quickly became their most popular sub. People don't care about advertising unless it's really obnoxious.
The idea that people will unsub en masse once Open AI starts rolling ads is a pipe dream. And the kind of user that won't pay and won't suffer some ads is the kind of user nobody wants.