It's not so easy for them to integrate ads. I happily use LLMs to help me find the best product. As long as it really delivers on that. If I realize the results are manipulated by ads, i'll stop using it. Or I'll switch to a competitor LLM which does a better job. It would be a problem, if we had only one player in the market. But there are a few. And they need to be careful to not skrew their reputation. LLMs have a fundamental aspect baked into them. Namely the final goal of giving you "the truth" about a subject. This is an inherent problem for ads or any other kind of manipulation.