I'm surprised, and more than a little bit relieved that they didn't allow chats to be steered by ads. This could have been a whole new kind of marketing, where product plugs are e.g. slipped into the system prompt and come across as sincere recommendations. I have to wonder if this is still coming down the road.

I guess in the meantime, they will be able to use chat histories to personalize ads on a whole new level. I bet we will see some screenshots of uncomfortably relevant ads in the coming months.