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How much do you think advertisers would be willing to pay for ads on the side, relative to what they're currently paying? You can see how people wouldn't be willing to pay the same amount for that, right?

They also do this (or did?). But I guess on mobile this is not working well, because of limited screen estate, and people will obviously not focus much on them.

I agree that video ad experience on YouTube isn't great, but they do offer a subscription to remove ads at least.