Anecdotally, the quality of traffic from ChatGPT to one of my websites is much better than Google traffic, in terms of bounce rate and time on site.
If they managed to show ads in a carousel (like the video), it might get a better conversion rate compared to invasive Google ads (covering the organic results).
Though if OpenAI managed to embed the ads within the experience, that might work even better (conversion-based pricing). Examples would be having the shopping list from the grocery shop (in line with the recipe or the question), adding to the basket from ChatGPT, and pay.
In theory, they can even add a new GPTPay to simplify the journey.