Please note: The YouTube system works great, but the content doesn’t change. In a game, content will change often, so you can’t rely on the same system.
There should be a balance between upvoted comments and the date at which they are posted. Old comments that got lots of upvotes might not relate to the game any longer. Similar to how Spotify’s lists of most popular songs per artist isn’t solely based on number of plays, but based on recent frequency.