It seems everybody is a "Nazi" these days, except actual Nazis - who were historically on the political left, closely aligned with progressives (who they got their ideas about how to deal with racial differences from) and of course they were socialists.
Now the ideological descendants of the Nazis accuse everyone else of being Nazis - a classic case of projection.
So when Reddit banned The_Donald forum, they were actually banning the anti-fascists at the behest of the fascists.
BTW, it all fits together pretty well. The original Nazis hated pedophiles and sent them to the camps. It shouldn't be surprising that Reddit would ban both pedophiles and those who oppose fascism.