I have no proof, but it is probably with Youtube trying to compete with Tiktok. There are more originals content on Tiktok and on Tiktok any user can easily pub

I have no proof, but it is probably with Youtube trying to compete with Tiktok. There are more originals content on Tiktok and on Tiktok any user can easily publish content. So it would make sense that Youtube is trying to favor new creators and short videos. Actually a lot of Youtubers for a few months have been complaining, that the algo penalize channels that dont publish frequently. I'm myself a big Youtube watcher, and I have not been seeing significant changes in the videos I see, there is more short videos, and videos from Tiktok reposted here but in my opinion it is just because more content of that kind is being published. There is also a discovery problem on Youtube. They usually recommend you content that is close to the content you have seen recently (but it has always been like that). Once per week there is a truly original video that pops up.