This definitely has been bred from 'fitting content creation to the algorithm'. There seems to be many dimensions of this with the first being maximizing minutes watched which is where the meandering and stumbling content seems to come from. The second is monetization and knowing if you have to dispute it's essentially already too late, re-uploading is punished heavily and the algorithm heavily favours new content. The third is people observing that to get reliably recommended having a strict upload pattern seems to be favoured by the algorithm which can turn into 'produce to produce' instead of a creative effort. The fourth is just the overhead of dealing with claims and other weird administrative backend and/or YouTube making a sweeping policy change that generates dozens of hours of manual work for people with a large catalog. The last is that because of all of these previous problems many of these people moved over to twitch and then just use their old YouTube account as a clip/advertising mill/stream archive dump site.

I put a lot of the blame on YouTube, because people seem more than happy to reward/watch well produced content but YouTube's algorithm rewards daily junk content over polished content produced biweekly or monthly. You can see glimmers of old YouTube from time to time where the video is trimmed precisely to support the actual content even if it's 3 minutes or well edited to be engaging but YouTube keeps creating (and revising) a game where that kind of content loses.