I think we'll have to agree to disagree on definitions of "readily apparent" and "literally anything."
Though the "I know it when I see it" definition of obscenity is frustratingly open, it actually works in practice. Real human societies have implemented it and continue to implement it. This is not something you can write a script for, but that doesn't mean it doesn't work (I find technically-minded people generally have a bias against things that can't even be scripted in theory... Those things make up a lot of the world, inconveniently).
And yes, that means Redditors live in a world of ambiguity. Welcome to the world, I guess. Such ambiguity doesn't imply that, say, /r/science or /r/popmusic would be on the chopping block, and it'd be absurd to argue it does.
At least, the fact that /r/coontown is on the chopping block doesn't threaten /r/science any more than some hypothetical change in leadership in the future that decides Reddit is more profitable without any subreddits, and that can be a good enough point to settle on.
So relax; your favorite subreddit is not under threat, unless it probably should be. Ambiguity is the nature of real social structures, because humans are ambiguous creatures. ;)