It’s a cracked version of the game that has been heavily compressed to reduce download size. This is why the installer will eat a lot of CPU resources during installation. While you probably won’t be banned, I would generally avoid playing these games through steam as a precaution. Usually multiplayer doesn’t work normally anyways.

But what does it actually infer? The article is very low on details on that.

Lemmynsfw uses a custom version that that removes the blur for nsfw images but that’s it I think.