"Moderators at subreddits like /r/NoStupidQuestions, /r/science, or many of the "Ask ___" subreddits are responsible for instilling the voice and culture of the subreddit."

I don't see how this is the case. Replace spam with 'off-topic' and you have it. It really isn't an earth-changing thing to filter spam/off-topic/rude/offensive commentary (and it could be argued that even on the larger sub-reddits, that a good job isn't necessarily being done of that).

"Instilling the voice and culture" sounds like self-aggrandizement to me.

But I would be willing to be corrected.