Yes there are many apps which really pays bitcoins. There are many apps on the play store which pays by playing games, watching videos and answering the questions and completing the tasks as well . But in my opinion many of these apps are scam . And the other app's which pays , they pays a small amount of money sometimes it happens that the site suddenly closes and after when we open is again there no any coins which we have won by playing. So my suggestion is that don't play such type of games and don't use these applications because they are scam and you are only wasting your time on it . It pays nothing