It's much easier to take down the services supporting the thief, rather than taking down the thief. The thief won't care if you tell them to stop. But their do

It's much easier to take down the services supporting the thief, rather than taking down the thief. The thief won't care if you tell them to stop. But their domain registrar, web host, video host, social media accounts, and payment processor will care about copyright infringement.