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And Scott Aaronson quits mathoverflow due to this "off-topic" policy: https://mathoverflow.net/questions/282869/the-enigmatic-complexity-of-number-theory#comme

• weinzierl 9y ago
  This is so sad, MathOverflow was once such a great community. Here is his comment for context: > I regret to say I'm ending my participation in MathOverflow, for the same reason I decided a decade ago never again to edit Wikipedia. It's hard to express how disheartening it is to spend hours of volunteer labor explaining stuff---in this case, in a way that at least 19 MO users apparently found useful---only to have your work overridden by a smaller set of users, for being (part of something larger that's) "off-topic" or whatever it is. Who the hell has time for that? From now on, if I have math questions, I'll post them on my own blog. Was nice being here for 6 years; thanks everyone. – Scott Aaronson 3 hours ago