It’s kinda difficult to find cracked Linux-native games, though one site that I do know which has a section for it is Torrminator. Don’t really want to get in trouble with the mods so can’t post the link, but if you do end up finding the site, then I hope it has whatever games you’re looking for.
I personally use bottles installed through flatpak for non-steam game needs. Especially if you’re pirating, you can use flatseal to disable things like internet access for bottles (and games that you run through bottles) and inter-process communication, making it just a bit safer if you have trust issues.
Setting bottles up is a bit of a pain, but once you do that you can pretty much run anything through it easily