Think about it, almost everyone I know rarely clicks on ads or buys from ads anymore. On the other hand, a lot of people including myself look into buying something advertised implicitly or explicitly by content creators we follow. Say a router recommended by LinusTechTips. A lot of brands started moving their as spending to influencers too.
Google doesn't have a lot of control on these influencers. But if they can get good video generations models, they can control this ad space too without having human in the loop.