I get 82% (27 not blocked. I use Firefox ESR with uBlock and Privacy Badger.
This test is wrong for sure. It doesn’t detect YouTube ads as being blocked despite them never appearing in this browser thanks to ublock origin.
I also highly doubt that any domain from DoubleClick.com would be allowed through ubo.
My setup (Firefox+uBlockOrigin) blocks Doubleclick.net. Also, ads.youtube.com is under Social Trackers, maybe it’s not the actual ads on youtube, but some tracker? BTW, I have no idea how the internet works, maybe it is wrong…
YouTube ads are just other YouTube videos that you can watch willingly if you know their ID. The mechanism of serving them might therefore not involve the client connecting to any domains other than www.youtube.com
, and it probably doesn’t or it would be very easy to block them otherwise.