qbittorrent itself isn't malware so if it's somehow tripping malwarebytes that kind of speaks to its quality. you can add it but i wouldn't be paying money for malwarebytes active protection. the shit you're torrenting you should absolutely keep letting your AV scan, you can pull stuff back out of quarantine if needed but that's a last line of defense if you downloaded something bad. a lot of AV's will flagP2P traffic because torrenting shit is how people download malware.

what you should have if you're pirating shit is at least a VPN. i trust mullvad, some gamers™ don't like it now that it lost port forwarding but given the rationale i'm not sure i entirely trust companies that aren't going to soon follow suit or aren't lying about not logging IP's. more important than speed (and if you're just torrenting right on your desktop computer then it's not going to be that big a deal) is a guarantee you're not going to be snitched out. the speeds with the nicer VPN's is fast enough to max out my gigabyte connection and i'm not currently using a seedbox.