And you can't "build a bank," even in five years, as Simple just showed us, unless you have unbelievable wealth, or a bank already.
Furthermore, if you want to build a bank you must be prepared for "normal" (i.e., non-startup) growth rates.
"Four and a half years ago I sent an email to my future co-founder Shamir with the subject “Let’s start a retail bank.” Over the following weeks, Simple was born."
Was it a bank-like experience? absolutely(which is what I would argue is a HUGE part of the problem) but was it their own bank? Absolutely not