If you’re self hosting Nextcloud, you don’t have to worry about the server operator (i.e. you) enshittifying it against you. There is still some concern towards the software supplier, as we keep seeing with Firefox, but users can react to that.

I’m not really familiar with the situation around Plex since I’ve heard some mixed things, but I don’t use it and have lost track of what is what.

I would consider Firefox to be a bad actor but it’s a bit more nuance than the situation with, say, Chrome. Firefox is involved in the server side as well (i.e. evolving standards that enshittify the web more and more). I would like to have had the web standards frozen some years ago. BIFL should apply to software as well as to physical products.