I don't think Oracle and IBM want another Microsoft in Red Hat.
When I first came into this industry I was told that IBM was not someone against whom you would compete, ... That IBM was not a company. They were more like a country and a great country at that, and that I shouldn't even think of competing with IBM.
It's a nontrivial process to supply certification. IBM is much better equipped to go through it (than many companies). I'm not sure I can say that for these other databases,