A lot changed in the IT and regulatory world when it comes to the cloud. A few years ago, banks would nto even think about the cloud (maybe for dev and test but for sure not for production workloads. It was simply unthinkable that a bank would move their data in a hyper-scale cloud.
And to be fair, a few years ago, every cloud provider would have tried to avoid building and operating local datacenters or offering the right to audit to regulators.
As I said, a lot has changed.
Just recently the Swiss Bankers Association published a guideline
Cloud Guidelines: A guide to secure cloud banking. Giving advice how cloud and banking can find their way together.