Monzo is doing pretty much what you describe and are a real bank (in the UK for now, I believe they have plans to launch in the US soon) - they don't have cards per subaccount, but they are api first, which is nice.
I agree it's a sector ripe for rebirth - it's an interesting time to be alive - we're living through a revolution comparable in scope to the industrial revolution, and industries like banking, which are primarily about storing and moving information, will be radically altered. Banking is one of the last to be touched.
I agree it's a sector ripe for rebirth - it's an interesting time to be alive - we're living through a revolution comparable in scope to the industrial revolution, and industries like banking, which are primarily about storing and moving information, will be radically altered. Banking is one of the last to be touched.