Google Banks is something that scares me... A LOT. I use almost all of their services because I love them, but I don't think that I would go for a bank account as well.
They know where you are, who do you talk to, where do you work... and now, they will know all your finances.
Scary!
Still, I don't think it's really fair to compare Google or Amazon with startus like Transferwise or GoCardless