I was one of those who left. I let my adminship elapse after 10 years.

I also don't contribute much to SO, or to any SE properties, despite being on the early public beta. (remember the signup as a google spreadhseet). I'm ID 479 on SO.

Yep. And the deletionists where more often the "majority" culture and male, which resulted in a feedback loop for the nonminority and female. New minority turn up, have a bad experience and leaves. I think it was studied let me see if I can find the paper. I know the results were replicated with comment bots.

Update, not the ones I was thinking of but a good read. HBS Cases: How Wikipedia Works (or Doesn't) http://hbswk.hbs.edu/pdf/item/5605.pdf