Yeh, I think it was around 2010.

Over the course of a few months most of the mod team was replaced. It went from a place that was about 60/40 austrian to keynesian content to >95% keynesian.

Haven't been back there in many years, so not sure what the current slant is (betting it hasn't changed that much)

I'm not sure. I didn't start using Reddit until much later. By then you had to go to more fringe subs like ancap, although libertarian was still ok.