Brave browser works quite well to block YouTube ads, I’ve used it for a couple of years now and it blocks ads from most sites pretty good.
Changing the shield setting to "aggressive" hasn't beaten the block.
But I've heard from others that they use Brave with "standard" settings and still don't see the block. That makes me think they aren't in the A/B group and NOT that Brave has found a way to adequately block it.