The first one would have deleted nothing as it needs to match the whole name. I recommend running find with an explicit -print before replacing it in place with -delete or -exec. It’s good to remember that find has a complex order dependent language with -or and -and, but not maybe the best idea to try to use those features.

They used to say that 10 would be the last version and they’d just update that

Jellyfin was forked when emby went closed source, I don’t think it had anything much to do with any specific event at plex

Shellshock happened in 2014 https://en.m.wikipedia.org/wiki/Shellshock_(software_bug)

Don’t give it internet access during setup.