As you may found, in the past week many users got instant downvotes for no reason.

I checked this suspicious guy's posts as mentioned by @seanpgallivan, and found all his comments were came from new users with 0 submitted accounts. And he deleted today's post as it was so obvious and captured by @seanpgallivan in this post.

What's the point doing this? to promote your stupid YouTube channel? just a shame.

his website: https://irishirajj.github.io./
https://leetcode.com/IRun_Man/
https://leetcode.com/discuss/explore/february-leetcoding-challenge-2021/1052855/bst-right-view-well-explained-video-solution-also-included
https://leetcode.com/discuss/explore/february-leetcoding-challenge-2021/1050651/simplify-path-well-explained-simple-code
https://leetcode.com/problems/koko-eating-bananas/discuss/1046253/detailed-explanation-100-fast-optimized-code-video-solution-also-added