That's just misinformation. I put some shows onto a Jellyfin instance and not a single one has disappeared. Not even an email about something being dropped soon. So that's a core part of the Netflix experience you're just not getting with Jellyfin.

Heck, it doesn't even randomly force me to watch in 1080p or 720p despite being on the 4K plan and the show/movie being available in 4K. It's like Jellyfin isn't even trying.