> Just wait until the foundational models are all fed with increasing amounts of ads.
Which foundational models?
Not all model providers are in the ad business and while the chances of building a supercomputer in your basement to train such a model are zero, some of the companies that build such models aren't exactly huge. Mistral for example is (according to Wikipedia) 150 people - this means that a company that can make their own model from scratch doesn't need to be some giant corporation. Which in turn means that it is possible for new companies to pop up, if there is a need for them - in this case, if some models become ad-infested, chances are other models will use their ad-free status as a feature.
And this is assuming only companies make such models. But some days ago i was reading here in HN about a new foundational model being trained by ETH Zurich and somehow i doubt a public university will inject ads in it.