I have been playing YouTube videos on my TV of birds & wildlife, for my house cats to enjoy. There is one guy who makes 8 hour long videos. There is one content creator basically targeting this market of "birds for your cats to watch".
I have noticed that the YouTube app on my Samsung TV will play for an unbelievable number of hours without any "are you still watching" prompt. Easily 6 hours!!
I've been playing them videos almost daily for weeks and only got this prompt this weekend finally.
So some companies probably think they are paying for targeted ads to some category like "people interested in cats / wildlife", YouTube collects a cut and pays the content creator a cut. All this for feline-only eyeballs.