Instead of writing an entire essay, I'm glad I could edit the post together and sum it up. I did some easy research. Again.
So, he claims most ads won't be played properly on mobile devices or his TV, meanwhile all ads are played on PC.
He checked his TV, which got 2 ads. He checked his mobile which got 1 ad. And the PC which got all 4 ads.
I will give it away: Phil is an horrible investigator, but it's not his fault, nothing he could do.
Apparently Dave Burnett is not aware that ads can easily change each time you refresh the video. The videos searches for a new "pool of ads" each time, sometimes there are more ads, sometimes there are less, but they are there and kinda try to equal the quantity -- for all I could understand.
Obviously, when the ads change each time there is no fixed ad dedicated to your video, it's more like some kind of "pool". If you activate every single "pool", the videos gets the potential to use any single pool. Also, from left to right, the ads make more money as they are longer and more dominant. But also most common to less common, from left to right.
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For example if you check Dave's videos without adblocker (darn, I gave him money with this, right?) you can encounter every single "pool". As I encountered a non-skippable, there was no ad after that. Could be an error, but I tip on the level of reasonable quantities. You can't, you will never, there is no way a video will have more than 1 non-skippable ad. The one I encountered had the length of 1 minute (uuuugh), so waiting 1 minute to hear a pig grunt into the mic.
Sometimes the pools seem to be "empty", which is, fair enough, strange enough. Sometimes there are 6 overlay ads, sometimes just 4,
even on PC so Phil's explanation is invalid. This could be an error, but maybe it has something to do with the contract in between Youtube and the sponsors. You see, the sponsors have to pay for every single ad (with the small ones quite cheap, the bigger ones quite costly). If their ads get shown in unlimited quantities, everywhere, they would go bankrupt very fast. So this can't be the way it works. Instead the image of a literal "pool" seems still quite fitting.
Maybe, just maybe, what if there are only
so many existing ads allowed at the same time, based on the contract? You literally learn in business school how costly every second of ad time is, so
not limiting the amount of played ads on the whole website would make no sense. So it could happen these "pools" go empty because the video couldn't find a fitting ad. You should never forget, the video creators aren't the customers, they just wear the fancy t-shirt which states "Buy this stuff". The real customers are the sponsors, the producers of service and goodies.
Also Dave is literally blind. The most common and cheap type of ad which he also uses:
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DESKTOP. ONLY.