Are all cloud mining apps a scam though? Or just some of them, like the ones you've listed here? I realize that it might be unsafe and opens so many rooms for scammers that "rent out" hashing power, but can't that be legit sometimes? I don't see what's wrong with someone investing money in pool mining in exchange for a Bitcoin reward share.

Anyway, that got me thinking, is all those apps are scams, how did they wind up on Google Play in the first place? Shouldn't there have been an inspection of some kind?