I also think adtech corrupting AI as well is inevitable, but I dread for that future. Chatbots are much more personal than websites, and users are expected to give them deeply personal data. Their output containing ads would be far more effective at psychological manipulation than traditional ads are. It would also be far more profitable, so I'm sure that marketers are salivating at this opportunity, and adtech masterminds are hard at work to make this a reality already.
The repercussions of this will be much greater than we can imagine. I would love to be wrong, so I'm open to being convinced otherwise.
But financial nightmare scenarios aside, I'm more concerned about the influence from private and government agencies. Advertising is propaganda that seeks to separate us from our money, but other forms of propaganda that influences how we think and act has much deeper sociopolitical effects. The instability we see today is largely the result of psyops conducted over decades across all media outlets, but once it becomes possible to influence something as personal as a chatbot, the situation will get even more insane. It's unthinkable that we're merrily building that future without seemingly any precautions in mind.