I've noticed "has this sub gotten more right wing recently?" posts reaching the top post of the day in the last 6 months or so. r/norge and r/unitedkingdom being examples. You can automate bots that change a subreddit's consensus on certain topics by bot-spamming threads pertaining to those topics, especially in the first hour of a thread going up. I don't know if that's happening, or if it has more to do with the Reddit protest that saw mods abdicate their positions last June and new mods being responsible for the change... but it could also be a bit of both.