Problem was he sold it. Can’t profit off a mod because it’s technically profiting off someone else’s work. Not defending it, but it’s well known in the modding scene that you don’t do exactly that or this predicably happens.

Basic rules are simple: don’t announce you’re working on it, just release it. Can’t remove the files from the Internet once they’re there. If you announce too early, you give them time to shut it down before release.

And never, EVER, try to profit from it. You run into all kinds of issues, even just using the games name.

This isn’t legal advice so much as “if you want to mod and actually have it see the light of day, follow these guidelines or you’re pretty much guaranteed to get screwed”.