Nothing, a person watching a video to learn something is perfectly normal.
But if AI scraping were a person, they would be doing the equivalent of watching the video, then downloading it, then chopping it up into chunks to use in their own video, or as a script, without permission or even attribution. For profit.
Just because AI does it on a vast scale, it doesn’t make it right.
A perfect example of how damaging this sort of thing is can easily be seen in real time by observing the number of websites going out of business since Google’s AI overview came in.