LOL, you guys are putting my cuddles at risk from my BF, you're making him swear so much. He's worked for some of the companies that made the models you have on your front page and now he's just seen this post. I'll post a brief and polite version of what he said... wish me luck.
Companies that provide a support network to modders, generally do so with strict copyright rules in place. There's one of the racing sites that won't allow any ripped content from other games to be used as mods. That's a rule that most games that have a mod-supporting developer behind them will have in place. They won't allow that, because it would make them appear to condone the theft of another company's copyrighted content and that would be commercial suicide. I think SCS might have the same policy with ETS2 and ATS, not 100% sure on that though.
But take a look at the main page of this site and count how many games have been the source of the vehicle/ped/weapon mods you see. Not only does this site appear to allow copyrighted content to be used, it does nothing to actively discourage it and it also monetises it itself, by placing ads on pages with copyrighted content taken from other games. That's as well as the modders monetising it with Patreon and PayPal, so is it really just Take Two and Rockstar that are driven by greed? There seems to be a lot of money-demanding going on here, for things that have been ripped from other games. It's hard to argue against the illicit use of mods, when the mods are illicit in themselves. Could you live with 100% copyright-free mods, no cars, weapons or peds from other games? Think about how few mods you would get if that happened.
No publisher or developer with any sense, is going to associate themselves with that kind of community though. It's not greed that dictates that, it's common sense, or more appropriately business sense. You never put your business on the wrong side of a legal/ethical line and this site is way over the line. I get the impression that if Take Two tried to put any rules in place, the modders would tell them to F*** Off and they'd carry on as normal. In fact, didn't that exact thing happen with the modding tool OpenIV? Take Two put out some rules and everyone pretty much said "F*** You we'll make whatever mods we like". I'm sure I have seen YouTube videos of the map which caused the problem in the first place, wasn't it from the previous GTA game? In fact, I think there's something for it on the front page right now, One WTC & 432 Park Avenue.
Okay LOL, I'm cutting him off there because he won't stop talking and I'm probably gonna get the grief for what he said... and I'm far too nice to be getting grief. I'm going to bed now and so is he.