I didn't. It wasn't subversive, like the parent comment. It just worked out that way because of technology acquisitions. Customers wanted to hear their data was "on Oracle."

My take is that the overhead of maintaining and using Oracle means that you have to cut resources somewhere else. I'm pretty sure a competent DBA and developers can ensure atomicity and integrity using Postgres (instead of Oracle), and have a lot of time left over to create more features in the application.