I don't know, but the collateral damage is that if you're late to comment under a popular video (even if it's 24h after release) an otherwise valuable comment w

I don't know, but the collateral damage is that if you're late to comment under a popular video (even if it's 24h after release) an otherwise valuable comment will not get upvotes and visibility. There's a huge rich-getting-richer bias. Maybe that was the plan: creators could be more inclined to moderate comments shortly after the upload, and trolls will not try to get their fix if they know nobody will see their comments.