I had a skippable beginning ad pop up with one of her videos, too. ^_^ I think we can technically monetize a video with only the display ads (???). That would put an ad to the right of the video, above the video suggestion list. I think that particular ad blends in the best as far as ads go -- mostly because I'm used to an ad being there since around 2008. I'm not sure how much money the display ads make in comparison to the skippable/overlay/non-skippable video ads, but I'd assume it's much lower..... I have seen a few bigger YouTubers leave the ads off from many of their videos, but they almost always either have a Patreon account, or are selling products of some sort. I've also seen some pretty ingenious product placements! I like watching some of those videos -- YouTubers can be so creative! =)