We must be working in a different world. In all my career I've not once worked with a serious business that did not have a support contract for their database system open source or not.

Most of those had escrow agreements for central closed source components with vendors in case the vendor went out of business. (obviously only for things perceived as critical and from companies with some perceived risk of failure).

And god knows how many times have I experienced companies biting themselves because they bought into a product that turned out not to deliver what was promised after the contracts were signed.