I have seen a comment about them being terrible for advertising, it looks like a "good" idea but it is not.
The problem is that the attention of people watching these videos drop to almost zero, too much is happening in a too short amount of time, and as a result nothing is remembered, including the ads. It is a very good deal for whoever is monetizing this content, they show a lot of ads, plenty of revenue, but not for those who are paying for the ads. It is like subliminal messages, "good" idea, but not very effective. For ads to work, people need to pay attention.
I don't know how ads in chatbots will turn out and what form it will take, but I think it is inevitable.