I may be wrong but I think it's mostly for things like enterprise support in case something goes wrong. IBM has had a large footprint in enterprises (WebSphere MQ, etc). People don't want disruptions in case your own kafka cluster with in-house engineers accountable for everything. So having enterprise support for product/ infra gives a sense of safety. At times rightly so. Depends on a lot of factors- risk appetite, capabilities of in-house engineers, what's at stake, and mostly psychological safety, etc.