The sheer number of modding communities, including Doom's, that utterly fail to realize this is kind of insane. You try to tell them that they basically have no right to restrict usage of their product whatsoever because it uses the assets and code and engine and whatever else of another product and the company that produced the parent product did not see fit to grant them any significant rights, and they act like you just told them you have a right to kick their door down, steal from them, and fuck their asshole. You tell them that the devs have every right to take their mod and just put it into the main game with no credits and they think you are lying to them. You tell them that they should make mods for fun, that they should make content because they want to play that content, and they think you are completely insane.
As far as I can think of off the top of my head right now, the only game where the devs granted modders rights to release mods under any sort of restrictive license, or claim any sort of intellectual property rights to the mods themselves, is Minecraft. I'd have to go read the license agreements again, but I'm pretty sure the only reason they did that is so that they can sell various mods in their store and split the profit with the mod developers. For basically every other game I can think of the best you could even argue legally is that you own any code that you wrote (and any asset you made, assuming it was made entirely from scratch). For everything else, releasing it under any sort of license or claiming any sort of distribution/reuse rights is basically just swinging your dick around and hoping the devs don't pull out a sword and chop it off, legally speaking.
