[manquer]

Rarely it is a just technical decision, usually money is the reason.

In small and mid size organizations the CSP gave better pricing, or they help with your sales etc

In large organizations - IBM/Oracle bundle their existing products currently being paid for any way, or account managers have great relationships with decision makers , the company already has signed up big multi year deals.

This is not just IBM, it applies to GCP/Azure/AWS as well.