Most of the money making apps are being monetized showing video ads intermittently. Most of these video ads are between twenty and thirty seconds long.
Yet indicating how some users are cheated, denied credit for the ad shown, the user is not credited after viewing Probo and other ads.
So effectively the advertiser gets free advertising, while the viewer who is watching the ad only hoping for some credit is not getting anything, only their time is being wasted.
In some cases, the user has to view 3-4 ads before the app account is credited for viewing the ad