And 98% of it is just grabbing popular snippets of long form videos, cropping them slightly, and overlaying some bubbly animated text (or worse, just closed captions but with a bright font).
It's almost as annoying as the deluge of people who email and say "we can auto-translate your content into 20 languages!"
Also, a channel that posts shorts exclusively needs like 30 million views to be monetized, you're infinitely more likely to reach that threshold creating compilation of cute cat videos than with your own original content (regardless of the niche). I'd be shocked if even 2% of channels earning money from shorts create any original content what so ever.