Trend Micro has an article on how companies should better ensure their (multiple) apps are published under the same account/name so that uses can better determine whether they are fake or not.
For example, how do users know all the Santander apps below are official?
Trend Micro previously published an alarmist article saying that “70% of top free apps have fake and mostly malicious versions in app stores” and that “80% of the top 50 free apps found in Google Play have bogus versions”. However, they later added the caveat that “Note that the fake apps samples we gathered are from third party sources and none was found in Google Play“.
So, if you only distribute via the Play Store (or App Store) should you care? I think so. If people download a bogus app from anywhere it can lead to loss of a user/customer, financial or information theft, fraud and loss of reputation/trust. You should direct end users to download from specific app stores, pre-declare your one publisher name and ask end-users to check this prior to downloading.