There’s torrminator for once, it has a section for linux cracks specifically. There’s also a large collection on the internet archive of native linux games that you’d have to find for yourself (to keep in line with the rules), but it shouldn’t be too difficult.

I personally use bottles via flatpak and flatseal to make the games not connect to the internet when it’s not needed just in case.

If you want native linux games, there are sites for that.