"The advertisers will have no metrics on how often the ad was skipped over"
Lots of the advertisements ask you to visit a custom URL or use a discount code which the advertisers can use as lower bound on how effective an advertisement is.
You can argue the custom code is enough, but you're still missing out on a lot of metrics, most importantly when the decision was made (in which part of which video).
Lots of the advertisements ask you to visit a custom URL or use a discount code which the advertisers can use as lower bound on how effective an advertisement is.