As far as I'm concerned the inclusion of the "anti-DoTA" clause in their EULA murdered it for me. I was so excited. KSP is one of my favorite games of all times, largely as a result of the vibrant and very technically advanced modding community. Same goes for essentially all of my favorites; Rimworld, Backpack Hero, Factorio. The free labor that expands the games in major ways extends the value of my money and let's me have fun forever in them.
Putting in a clause in a EULA which automatically and irrevocably assumes all ownership and rights to any code or assets that are created for a game is just too far. Assuming rights at all is a huge issue for me, but I can accept that it is beneficial to assume royalty free licenses to the mods, I'll even begrudgingly accept clauses that allow developers to gaffle features and optimizations from mods without giving remuneration or even acknowledgment. But wholesale ownership that revokes all rights and licenses for the independent 3rd party creator. Fuck that. I will never support a game that I find out is treating the people who keep games alive and relevant for decades for free like that.