YouTube is moving quickly to make changes in the aftermath of news that revealed rampant pedophile behavior.

The platform said on Thursday that it will turn off comments on nearly all videos featuring kids – potentially affecting millions of posts on the site – after reports last week showed that pedophiles were leaving inappropriate comments on innocuous videos of children. The change comes as YouTube grapples with moderating content across its site as concerns about hate speech, violence and conspiracy theories continue to plague it.

These people have circumvented the rules by linking to timestamps in the videos that show children in compromising positions out of context, while others just make sexual comments. The visuals are often re-uploaded on new accounts and get huge numbers of views. It seems like the signal from these accounts is so strong that it reveals a major shortcoming of YouTube’s algorithm.

Advertisers including Nestle, AT&T and Fortnite-maker Epic Games pulled ads from the site as to not have their content associated with such behavior. After making some changes, Nestle returned, but the other companies have not followed suit.

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