I love the idea, but most servers only host a couple of videos, it’s very hard to find enjoyable content on there and it’s difficult to figure out which server could be a good server to make an account on…
I wouldn’t mind a centralized aggregator of videos and maybe it could have a suggestions algorithm as well or whatever. Not that this would be ideal in the long term but it could help get the videos some views and make more content creators see this as a good alternative. It’s not safe on youtube, people aren’t even saying suicide anymore ffs
Edit: Even some renowned german media have their own peertube servers that they feed with high quality videos, but of course they have basically 0 views. (https://peertube.heise.de/, https://tube.taz.de/)

I think most of the reasons can be classified as there is no incentive for content creators to post videos, other than ideological purity. And the creators of peertube absolutely will not use underhanded tactics to drive growth.
That will sound inconsequential to most peertube fans, which is part of the problem.
But there is a reason why YouTube is hard to compete against, and one does not win that using the high ground