For movies and TV shows people either rip them off of personal collections and/or download them from the internet.

When combined with `yt-dlp` you can use it to download videos from your favorite channels. This is especially valuable as there's no guarantee the videos will be there for free forever.

It's also a nice place to put family videos and recorded sporting events.

I have a script that scrapes a few youtube channels which my kid uses jellyfin to watch. Youtube is otherwise not allowed, too easy to watch all sorts of crap.

Same. Big fan of the YouTube metadata plugin.

Didn't know about that. Thanks.

Legally purchased DVDs and home video collections that have been legally backed up onto hard drives

Same. Illegally backed up, in my case, because the DMCA is ridiculous and prohibits backing things up unless you crack the DRM personally. But I don't care, as that is a stupid law and I have the moral right to rip my discs if I want. But the content was legally purchased originally which is what matters imo.