Many do .. and many offer docker and howto guides.

https://seedboxes.cc/ https://dediseedbox.com/wiki/knowledgebase/jellyfin/ https://www.rapidseedbox.com/blog/jellyfin-vs-plex .. etc.

You're right. Plex is rolling out some plex-pass crap and jumping their pricing from 120 to 250usd for a lifetime pass. Hard pass for me, installed Jellyfin last night.