There have been some hard right subs, but most of the larger ones are banned now.
I find a lot of the mods of large subs are quite power hungry too, for example r/soccer. If someone breaks some news, linking good sources, correct post format etc. mods will regularly take the post down and repost it themselves or just leave their own posts up so they get the karma for it.
When I first joined that kind of thing bothered me, and I enjoyed getting internet points and actively tried to get karma. Now if I think something is funny or relevant I'll post it, but generally avoid big subs and stick to smaller niche ones about a certain topic, like a phone, programming language, football club, watch brand, cryptocurrency etc.