1. Trust a provider which whole existence relies on trust and which you can audit or at last cross-check the audit and security processes (as a Bank you are normally not a small customer).
2. Trust a provider which might 1st be a potential competitions in some business fields. 2nd is so big that it can easily afford losing you. 3nd for the same reason doesn't allow you any insights into there internal processes. etc.
Plus many of the banks having their own hardware also have their own IT team. So it's often about trusting your own people. I mean either you keep your it or you outsource _and_ go into the cloud. Keeping local servers but outsourcing IT at the same time seems kind not very clever tbh.
1. Trust a provider which whole existence relies on trust and which you can audit or at last cross-check the audit and security processes (as a Bank you are normally not a small customer).
2. Trust a provider which might 1st be a potential competitions in some business fields. 2nd is so big that it can easily afford losing you. 3nd for the same reason doesn't allow you any insights into there internal processes. etc.
Plus many of the banks having their own hardware also have their own IT team. So it's often about trusting your own people. I mean either you keep your it or you outsource _and_ go into the cloud. Keeping local servers but outsourcing IT at the same time seems kind not very clever tbh.