Paying customers absolutely HATE the idea of their data being used to train AI models without their permission - this Zoom story is just the latest example of that.
Companies that try to do this will get burned. Zoom just got burned really badly, and I personally don't think they actually intended to even do this - they just didn't make it clear enough that they were NOT going to do it, which sparked a PR nightmare firestorm for them.
I think the incentives for companies are very much the other way round: if paying customers hate this, then the incentives are NOT to do it.