Is it "theft", if you look away, when a YouTube ad comes on? Do they own your attention? Most rational people wouldn't consider that "theft".
Edit: To my knowledge, at least, this isn't "click fraud", at least, not in the traditional sense, of ads being reported as "clicked", when they're offscreen or not actually shown on the phone's display. My understanding is that this is simply displaying the actual videos on the phone (legitimate "view"), but the owner of the phone simply doesn't watch all of them. Or, sometimes does, if they prompt to continue, etc.
Is it "theft" to own multiple television sets, turned to multiple major networks, and not focusing your full attention on each and every set, especially when the ads come on? It's basically like that.