There have been a lot of strange things going on for a while at reddit.
Banning people because they mentioned the alleged ponzi scheming of the CEO's husband,
Making a bunch of crappy sub-reddits defaults, removing other (crappy) sub-reddits as defaults.
This just seems to be the tipping point for a lot of people. I don't think most people really actually cared about the ban, but the way it was done and the obvious other sub-reddit targets that were just ignored, or had excuses made for them.
I just looked back at digg.com for the first time in a couple years from when it flamed out heroically on it's 2.0 launch. It's not horrible now, there doesn't appear to be too much drama on their front page. Looks like delicio.us Just a abc/cbs style repost of yesterdays "hot web news"
supposedly people flocked to voat.to so hard they took down the site.
The other thing people seem to be doing is re-enabling adblock on reddit, and voting with their purse strings by not purchasing gold anymore.