It also seems like people are downloading these videos from their creators' channels and then reposting them under their own accounts.

Better defaults

Cooperate with the authorities to find and investigate people who post creepy comments? You already can't post bomb threats online without getting an investigation.

Bomb threats are illegal. Creepy comments are not.

This may be an awkward position to take in public, but I'm not comfortable with the idea of criminalizing "creepy comments", especially on the internet.

I once saw police notified because an employee was looking at gunbroker.com on a company computer. Looking at listings of guns for sale is not illegal, but it bothered the company enough that they called the police and a few questions were asked.

Comments that cross the line into "grooming" are definitely on the continuum of child abuse, which is illegal.