If you work at a bank that uses real cloud services (AWS and Azure in my case), they still lock down most of the options. They want control, ease of maintenance, and most of all: auditability. More options creates more overhead. Simple is good.

I did recently wonder if it made sense for banks to put all their stuff on other people's computers, instead of maintaining their own, but for the bank I work at, the old on-premise systems are maintained by IBM and ridiculously restrictive, so either AWS or Azure is already a massive improvement.