People have complained for years about over-moderation on SO. Here's a good overview article[0]. You may also want to look into recent controversies about licensing[1] and how they treat their community moderators[2][3] (both of which were on the front page of HN).
[0]: https://hackernoon.com/the-decline-of-stack-overflow-7cb69fa...
[1]: https://meta.stackexchange.com/questions/333678/was-the-retr...
[2]: https://news.ycombinator.com/item?id=21113344
[3]: https://news.ycombinator.com/item?id=21176712