oof I have no idea. I'm currently paying nothing but will have no problem paying the customary $20/mo when it's necessary (which I suspect is not enough for profitability).
It's hard to see how ads wouldn't ruin this AI experience, particularly if they do LLM tricks to integrate the ads into the output. Part of what I like about the AIs now is I have a pretty clear high level understanding of what they're doing and it still feels relatively objective, unsullied. Ads bring in evil.