They’re already in hot water because of lying to their customers over this. They actually track ad blocker usage because lying about ads getting played when they weren’t would be fraud. In fact they’re getting sued by a whole bunch of advertisers because the “100% verified watched ads on Youtube.com” were actually playing in hidden frames on random websites.
I’m pretty sure the anti blocking, remote attestation direction Google is taking is an attempt to quickly fix this situation before it can get out of hand. They don’t know what ads plays are legitimate anymore and their customers are angry about it.
Worst case scenario, all Youtube advertisers over the last x years get their money back with some compensation, which would be devastating to Youtube as a product.