I tried to switch from plex to jellyfin 2 months ago, running both at the same time in containers, but I removed jellyfin after a week

The main issue was the CPU usage, on idle Jellyfin was using about 1vcore while plex used only 0.3, no background tasks seemed to be running and after a week my 4tb of media should have been indexed

Also a feature that I use regularly with plexamp, starting a radio from a song, was not giving me good results on finamp

Here is the story OP might be thinking of https://www.laquadrature.net/en/2023/10/06/the-beginning-of-the-8-december-trial-is-also-the-judgement-of-the-right-to-privacy-and-encryption/

So nobody was arrested for using signal, however it was considered as incriminating evidence during the trial that they protected their privacy and didnt want to give their im encryption keys to law enforcement