YouTube desperately needs a law that says an ad must be marked as such and clearly separated from non-ads. There's this game of cat and mouse I find myself playing against youtubers, who are now at the point where they manipulate their tone to hide the fact they're about to segway into an ad.
(one popular technique is to continue a sentence as if nothing happened, and shift its topic mid-way, like in the case where you should really all just buy my new book now)