One way to fight back is to try to get the video ID of the advertisement from the debug info, go to the video directly and leave a dissatisfied comment. This will work until they hide that ID anyway. Or the advertiser turns off comments. At that point we’re left with sending our disapproval in other public forums, preferably the more public the better.
“Your ad was shown to me on a pause screen where I don’t want to see ads. As such I will ensure that I do not purchase your products for the foreseeable future and that I will recommend that friends and relatives do the same. Thank you for participating in YouTube customer feedback.”
perl -wle