Click bait has been a problem for way longer than the dislike stats being hidden. Also, the algorithm still takes dislikes into account, and it's still easy to dislike content. The problem is that click bait works and when your average person falls for it, they don't hit the dislike or report buttons, they just click away after watching just slightly more of the video than was necessary to identify it as click bait. As far as the algorithm can tell, they enjoyed most of the video, so it ends up getting recommended. Veritasium has a particularly good video on this exact topic, and the honest solution isn't bringing back the ability to see dislike stats, it's that legitimate videos need to stop using boring thumbnails and video titles. Nobody clicks on them, so regardless of likes/dislikes ratio they will never get promoted.