May I ask what I should look for in the log files to detect this (and so I can configure fail2ban correctly)?

This is a really great ELI5 explanation of how Usenet filesharing works technically, nice!

Have a look at my German Usenet beginners guide: https://github.com/PCJones/usenet-guide

Let me know if you need any further help

For all German speakers I have a beginners guide: https://github.com/PCJones/usenet-guide

I also use a Hetzner Storagebox for my Jellyfin instance, I mount it via SMB. Works great.

For German stuff there is xrel.to

Usenet is the secret for German stuff. I have a German beginners guide: https://github.com/PCJones/usenet-guide

This looks great! Does it have support for multiple regions/languages like Overseerr?

I can give you info about a provider that offers full F1 TV access for 20-30€/year, I've been using it for a few years now. It's great and you can easily stream it on any device. Send me a DM if you want more info

You might want to have a look at Usenet. Yes, it costs money but it's such a premium experience compared to torrents and you don't have to care about seeding etc at all

Just having a Jellyfin instance for family and friends. I have everything in h264 for maximum compatibility to avoid transcoding. All 12 seasons of Bones (2005) take up 800GB alone for example. A 1080P Remux movie takes 10-40GB

Really depends on your usage. I have a few Terrabytes of Usenet traffic every month so I'm glad I don't have to use block accounts for that