Pray for Grayjay and ReVanced.
Sauce: https://www.theverge.com/2024/4/15/24131338/youtube-ad-blocker-crackdown-mobile-apps
In an update on Monday, YouTube writes that users accessing videos through a third-party ad blocking app may encounter buffering issues or see an error message that reads, "The following content is not available on this app."
Last year, YouTube "launched a global effort" to encourage users to allow ads while watching videos or upgrade to YouTube Premium. It also began disabling videos for users with an ad blocking extension enabled.
But now, YouTube says its policies don't allow "third-party apps to turn off ads because that prevents the creator from being rewarded for viewership." The block targets third-party apps that use YouTube's API to get videos interruption-free.
Sauce: https://www.theverge.com/2024/4/15/24131338/youtube-ad-blocker-crackdown-mobile-apps