YouTube has disabled comments on millions of videos because they were being used by pedophiles to communicate with one another and, allegedly, even link to child abuse videos…

Source: https://www.theregister.co.uk/2019/02/28/youtubes_pedo_system/?fbclid=IwAR3T00-LUBGKDtmjGDrvYrCPQyJSk5iyV3Tqyj2xfzse2pk7kAHETh403QU