It's reasonable for a non-technical person to assume that any app whose provenance is known (thanks to the App Store's policies and requiring a valid DUNS number or similar) would be investigated & punished if they end up doing something malicious, so as long as traceability can be ensured (which it is) then it must be safe.
I myself used to think that as long as I use apps from a major brand (so like Facebook, Google, etc) I should be safe because there's no way they're going to pull spyware-like tricks and steal personal data... right?