Because they're 2spooky
You should have seen WOW when Wrath of the Lich King came out... seeing an almost entirely skeleton-themed expansion de-skellified for the Chinese market was "interesting". Really, it's more about preemptive over-caution, because the only thing worse than having to censor the hell out of your game before release is releasing it, then having to pull it and make changes post-launch because you didn't censor it enough.