Is this a thing? i.e: a FOSS Linux system but with pre-configured pirated apps.
Imagine installing Linux and having Microsoft word, Adobe products, or some games pre-installed without pain.
I mean, you kind of just described two things that are specifically hard to get working properly on Linux in general - MS Office and the Adobe suite. You’re better off using FOSS alternatives, like LibreOffice and Krita or GIMP. Otherwise, you’ll need something like Lutris as a Wine frontend to install Windows apps - and at that point, you might as well just install stock Linux, get qBittorrent going, pirate what you want, and install as needed. Plus, I don’t think I’d trust the security of a modified version of Linux for piracy. That’s just asking to be exploited.
Package manager for pirated things seems more like to solution OP is looking for.
Yeah, this would make sense. In fact, I wouldn’t be surprised if there were a few “piracy repos” you could add to your package manager. I’ve never thought to look haha.