Is there a way to tell if apps have hidden purposes in the app store?

Apparently there was an app called Floppy Cloud, which was originally intended to be a file manager but it also turned out to be a hidden emulator for Nintendo games you could play on your iphone and ipad.
It’s no longer in the app store, but is there a way to tell if there are any hidden intentions in apps in the app store like that?

Or is there some website that could tell you such things?