Banks don't understand startups. Startups have no history and just appear out of thin air with millions of dollars in their bank account. And then they proceed to burn tens if not hundreds of thousands of dollars month on month until they die, or get flooded with more millions.
That's some weird stuff!!
A bank that understands this, knows it's not fraudulent, and makes it easy to withdraw, deposit, get credit cards, give loans/venture debt, has a competitive advantage in this niche but highly lucrative sector—given they can operate with the right risk controls.