I started to work with airpush. After 3 days of using their ads (standard banner + smartwall) our users started to get fullscreen ads that they can not close. Airpush doesn’t allow to close their ads using the “back” button so when users got that fullscreen ad with no close button they just got stucked (and started to leave awful feedback). The worst thing was that every time that this happen our app is being exposed to be banned from Google Play as this is their policies…
I sent a ticket using airpush helpdesk and a mail to their support email adress (I was even kind enought to attach an screenshot of each of the ads I found) and after ONE WEEK nobody has answered me. Their eCPM is not that great so I still don’t know how this guys have become so popular.