If you use discord for it’s intended purpose there really isn’t any issue. Choosing to imagine discord is something it isn’t and then getting shocked about it later seems like a personal problem.
I myself use it for basic chat with some gaming friends and memes. It certainly isn’t the place for sensitive materials.
Think of it like email.
The email provider is the instance:
Google, Yahoo, outlook, etc
The community/user is your email address:
Android@gmail, Android@yahoo
Because they are different providers you can have the same name since it’s the only one on that provider.
I have done basically the same thing. With a few differences.
I setup Transmission and SaBnzbd on the NAS but offloaded sonarr/radar/prowlarr to my server so it’s not taking up resources from the NAS.
Found Usenet to download significantly faster overall and sonarr/radar get releases from them much quicker then torrents. Only about 1/15 downloads end up being torrents.