I see the cto is in this thread. In what ways are you different than a bank like Simple?
The main difference is that Simple didn't have a banking license and didn't write the core banking system themselves. They had to work with a legacy bank (Bankcorp) and were constrained by their policies and technology. It sounds like this was rather frustrating. We are building the entire bank, including the core banking system and the regulatory approval. This is what we mean by "full stack". A good example of something we can do better because of this is the signup process. You will be able to sign up from your app and use your new account within a few minutes.
From a product perspective the biggest difference is that they weren't mobile first. But that would have been a bold move five years ago :)