Well, it seems to be official now. Starting April 14, 2025 Google will update its Unfair advantage policy to say it is allowed to show the same ad, from the same company, going to the same page, as long as the ad is in a different ad location. Google was just experimenting with double serving ads earlier and now it is officially going to be allowed.
I have a pihole and the youtube app on a smart TV. Trying to block the ad domains from the TV just bricks the app. Maybe I’m doing something wrong but, I got no luck.
You can’t block youtube ads with DNS blocking; youtube serves ads from the same domains it serves the actual video from.
You need a custom youtube client like Revanced.