To solidify getting rid of "wrongthink", they removed the upvote+downvote count.

Previously, even for opinions people largely disagreed with, you could see what number of people agreed with it. They changed it to showing only net numbers. I think this made it easy to use automated suppression mechanism i.e. they could read comments with algorithms and downvote automatically.

This was back when they were not banning subreddits for wrongthink, they were merely suppressing it.