What makes you think ads and the equivalent to SEO aren't coming for the LLM products? These companies are going to have to turn a profit eventually...
I've been very reluctant to enter any queries into any LLM that might let on more than I'm willing to make public. I think about the people who poured their romantic energy into LLMs - beyond how dystopian that is on its face, the LLM vendors now have the ability to ad-target that person to within an inch of their life, and every incentive to exploit this to the max they can.