If you have the best UX possible and no content creators (that people care about), you won’t get users and without users you won’t get content creators that people care about.
This. I have a small yt channel, my videos regularly get 10k+ views there. In the early days, I also uploaded to a couple of other sites (dailymotion was one, can’t remember the other). Where I was getting hundreds if not thousands of views on yt, I was getting maybe half a dozen on the other sites. My most popular video got nearly 100k views on yt, and last I looked on dailymotion it had something like 8 views. Needless to say, I didn’t bother uploading to other sites after that and just stayed on yt.
That said, I’m willing to start uploading to peertube once I’ve had a chance to look into it.
It’s the one thing that all (or most of us, I guess) have in common; we’re all here because of what’s going on there. It’s natural to want to talk about it.
It’ll pass; I’m already seeing a lot of non-reddit content on my home feed now, whereas day 1 it was probably 95% posts of the sort you’re talking about.