Connection limits could be one part of the story, im not sure what the defaults are in qBit but i have set mine at 100 or something like that. Another issue that you could be facing is the torrent itself, it might already have 100+ people with seedboxes seeding but only a few peers downloading, since so many people are alredy uploading its hard for you to get any upload in. Try a few other torrents, preferably once with only a few seeds but quite a lot more people trying to download.
I have been using ultra for over a year now and dont have the issue you are talking about. How many seeds/peers do the torrents have? Might just be that there arent a lot of people dling what you are seeding
its pretty easy to get into immortuos just head to their forum (its a different site then the tracker) and apply for an invite. Its your standart private tracker but almost everything is in german but you can change the UI language to english
While the laws are a bit strict piracy is still pretty common. But mostly with stream sites or ddl, torrenting is more niche and it can be a lot more difficult to get into specific trackers since there arent any big invite forums.
Dont think there is any dedicated tracker for 4k stuff, you might find some here and there. I know that immortuos has some 4k movies and i think TV and you can probably get some on other trackers by requesting it.
From my experience most of the stuff that uses steamworks for multiplayer can work on a pirated copy, you can only play with other pirates tho. Then games where you can host your own servers and p2p games can be done often as well. Some games that require you to use offical servers have server emus written for already but they arent finished iirc (i kbow of BO4 and Diablo3)
Prism needs a microsoft acc to work afaik, there probably is a fork that doesnt but i dont know of. All my recommendations came from either the megathread here or fmhy.net
From my experience yes, most releases include German and English often with subs. I prefer English dubs over german ones most of the time but a lot of family members want the German ones so I look out for releases that include both. Try and look for a "DL" before the source, like Movie.Year.German.DL.WEB-DL....
Prowlarr has some listed and once you are in some of the ones with more aktive forums you can find a some more. But i agree it is a lot harder to find german ones.
WOT, TFA, ST-Tracker, Torrent-explosive, immortous are some good ones but they are provate. There arent really any public sites but getting into the private ones isnt hard. I might be able to send you an invite to one or two ot them if i have any, shoot me a dm if you want one.
It is, you just gotta find the right sources. Im on multiple trackers that focus on german dubs and can get most of the stuff i want. Everything else is just a request away.
Ultra.cc has 1tb seedboxes for 5€ a month but iirc you cant pay with paysafe cards