Because YouTube pays Louis Rossmann, compared to selfhosting video which costs tremendous amounts of money through bandwidth.

YouTube changed something about their API to break 3rd party apps again. youtube-dl is also broken, but they’ve found the issue already, so it’ll likely be fixed after a while.

GrayJay and YouTube ReVanced still work in meantime.

[1] https://github.com/TeamNewPipe/NewPipe/issues/11255