Invisible
Posting Mad!
I'm going to assume you mean "unmonetized" not mobile. And that's not true. The majority of unmonetized ads, especially on small channels are because there was no ad inventory to display in the first place. And since most current phones are ad supported they are contributing now as well.
The fact of the matter is that there aren't enough advertisers to support the enormous amount of views that YouTube gets. Adblock is just a scapegoat used by people who don't understand. I would be shocked if the number of adblock users online was more than 10%. This program is not as prolific as some feel it is.
Is it really can be like this?
Im not informed by any numbers and did not researched yet, just thinking...
I would understand "Adsense for Videos" has not enough video ads, as long as not every small advertiser has a video ad to advertise with.
But with banner ads / text ads can advertise anyone via Adsense. And i can't believe Adsense can lack of ads, there usually always bidding competitions...
(though on poor countries there are less competition)
Earnings with only display ads of course generates much less income for youtubers than with video / insteam ads, but they still count as monetized views.