The rule is very simple ... noone gives you nothing for free just like that. So ... where is the hitch? The app is going to spy on you sending the private informations? The app will be part of some mining grid throught the app mining for creator? You need to finish some "offers" to obtain the bitcoins (if you really get them), which will cost you more money than the actual income? Theese scams should be simply criminal....
The rule is very simple ... noone gives you nothing for free just like that. So ... where is the hitch? The app is going to spy on you sending the private informations? The app will be part of some mining grid throught the app mining for creator? You need to finish some "offers" to obtain the bitcoins (if you really get them), which will cost you more money than the actual income? Theese scams should be simply criminal....