Same price as Mullvad, about a fiver a month, if you buy a year at a time. Annoying that you have to buy a year upfront but works out to the same price

I have it alias the external port to local port 2000 and point qbittorrent at 2000

Same

Proton does… but you need to use a shell script to enable it on Linux. It’s easy enough and documented on their site, but it’s annoying. Mullvad does not, that’s why I moved away from them. Can’t speak for others