The app I'd like to install is Chrome. The iPhone is only for testing. It doesn't leave the house and I don't use it as a personal device so there isn't really anything to protect on it.
Maybe I'm being unnecessarily stubborn, but I don't with to sign in with Apple ID on it.
I don't think Chrome would be region locked.
> Also, it’d be easy to ruin someone’s life by downloading
That could be restricted by requiring the user sign in with their device unlock credentials. I don't see how requiring the device be associated with online Apple ID helps protect you. After all, if someone malicious got their hands on the phone and wished to install something contraversial they could create and sign into a throw away Apple ID.