Reddit implemented this, and it was abused heavily to push trolls posts and disinformation up the algorithm, since by blocking people who disagreed with them, after multiple attempts the naysayers could no longer see the posts.

Somebody tested it, and was able to get their testing misinformation posts heavily upvoted after just a few days.

https://www.reddit.com/r/TheoryOfReddit/comments/sdcsx3/testing_reddits_new_block_feature_and_its_effects/