Reddit had a huge amount of tankies that only lived on a handful of isolated subreddits.

I don’t know about others but this hasn’t been my experience. From what I’ve noticed a lot of left or left-leaning subreddits have been taken over by tankie mods.
I’m much happier with how kbin/lemmy/mastodon/etc work, at least this way I can choose my left/hard-left/left-leaning communities that I wish to interact with without them being controlled by tankies or other authoritarian flavors.