@mathew @catsalad @mozilla @torproject @eff Yes, they currently do block it but they don't have much of an incentive to do so and it takes a lot of resources to keep that up to date. Right now they *have to* try blocking it to keep up with the competition.
If, with MV3, the lists have to be bundled and ack'ed by Google, there's great likelihood that this will die first. Either because the filter won't be ack'ed or because YT just updates their stuff too frequently.
Suddenly, not blocking YT becomes the norm and is considered "good enough". Much more of a comfortable position for AdGuard.
And yes, since the people around AdGuard invented the filter syntax *back then*, that's still the point of truth for the syntax. However, due to this standard, people using uBlock can also import AdGuard lists etc. With user filter import gone this feature goes away as well...