Counterpoint: this is (mostly) a zero-sum game. If sitewithpopups.com gets bumped down a slot, someone else gets bumped up, and the site getting bumped up is either a.) more relevant or b.) isn't being a jerk to its users. Google's widgets aren't going away; if you're going to be mad, be mad at the widgets, not the pushing-you-to-not-be-awful.

I think we can all agree that these types of overlays are terrible for users. And there are alternatives, like banners and static inline suggestions to download the app. I don't mind when sites put a "Read More" button that does little more than unhide some content, why not do the same thing to invite users to your app?