Unfortunately, you can't even get into the app without providing your phone number and then entering your banking information.
Nope, not happening.
It's not that I don't trust the kid making this app. I mean, I shouldn't trust him, but that's not even the issue. He is using a personal developer account, doesn't seem to have a proper company, is involving third parties for app functionality (including the banking info).
Even with the best of intentions, he's likely to get hacked or bought out, or his third party SDKs are, and there's no way to protect yourself from that.
You would have to be seriously foolish to type your bank username and password into this thing.
Maybe someone can make a virtual bank app, so you can sign up for virtual credit card apps...