Was it a Search or a Display Campaign for Google? I could understand that adsense webmasters used clickfarms. However finding out that google is using clickfarms for Search campaigns would be uncovering the greatest scam of the Internet.
This could be of course just ordinary user behavior. When searching something, I'm opening tens of different pages. Probably I scroll quite quickly through most of them. Just made some quick tests and I think on mobile phone I also act as described, so just flick to the end of the page glancing stuff on my way.
With a mouse, you get slight movement even while scrolling or pressing buttons, but with a trackpad or on a mobile device you don't, there's "mouse movement" even if you explicitly do some aiming before a click.