I used to work for Oracle. I can recall Oracle sales reps telling me how important it was that we internally used the software we sold to our customers, because if we didn't trust it with our own business, why should they trust it with theirs? Maybe Microsoft doesn't think the same way?
Of course, Oracle has so many different software offerings (duplication due to acquisitions, and lots of industry-specific offerings), it couldn't possibly use them all internally. But at least its sales reps could say, that if they weren't using the specific product they were selling, they'd be (for non-industry specific functions) using an equivalent product in Oracle's portfolio.
Agreed, it's definitely not one size fits all. The story of Amazon migrating off Oracle is probably in the same ballpark (if that story is true - I don't know one way or the other). To which point, again... it's a totally valid perspective that you have!
> Amazon’s Consumer business just turned off its final Oracle database (some third-party applications are tightly bound to Oracle and were not migrated).
No idea what those “third-party applications” are and how significant they are - they could be insignificant fringes or extremely core business systems (such as payroll or general ledger)
Of course, Oracle has so many different software offerings (duplication due to acquisitions, and lots of industry-specific offerings), it couldn't possibly use them all internally. But at least its sales reps could say, that if they weren't using the specific product they were selling, they'd be (for non-industry specific functions) using an equivalent product in Oracle's portfolio.