It's not quite that simple, it's if you have a relationship with the seller of the product that the average viewer(tm) would not expect. So, e.g. product placement on daytime TV or quiz shows doesn't require disclosure, because the regulators/courts have decided that's what the average viewer would expect anyway. But anything on social media does require it, it seems. I think produce placement in LLM chatbots would probably qualify as unexpected, though.