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YouTube is enforcing new restrictions on third-party ad-blocking apps. There's a new
announcement on the support page about the service tightening its crackdown on third-party ad-blocking apps.
When using such apps, users may may experience buffering issues or see the error “The following content is not available on this app” when trying to watch a video.
The service will only allow third-party apps if they comply with the
API Services Terms of Service.