That ain't exactly a study as people think of, something scientist do and that get published in a journal, peer reviewed, approved, etc.

It's just kapwing employee checking YouTube channel views and reporting it, same for the feed, so I can't say that the 21-33% number can be trusted.

Now the fact that YouTube has ai slop isn't new, but my bet is that many of these 'subscriber' are in fact bots used to inflate their numbers.

And on a more personal touch, I suggest you install YouTube unhook extension to your computer AND the ones of your relatives. The one less tech savvy that are the more susceptible to fall for this. I surprised my father once watching these kind of crap, he couldn't understand it wasnt even human made. Now I know he's safe from at least that.