The sad reality is that if it wasn't Dorsey behind this it would have to prove itself like any other business.
My guess is that you haven't solved payment if you have to get additional hardware. and even if that get solved what is to hinder Apple and Google from offering it natively which it should be.
How do you know they're not profitable? To the best of my knowledge, they've never released any public financial statements.
Usually when you're in the business of receiving and vending money, profits come naturally. Now, whether they've reached volume necessary to actually be profitable is a fair question but I have little doubt they've got a clear and well defined path to profitability if they aren't already there now.
Nope. As a privately held company, they have zero interest in making their balance sheet public. They obviously have little trouble getting investment or making deals and have little to gain from publishing their finances.
My guess is that you haven't solved payment if you have to get additional hardware. and even if that get solved what is to hinder Apple and Google from offering it natively which it should be.