I'm not sure if I remember this correctly, so don't take this at face value:

I remember some colleagues rolling out a project to thousands of postal service branch offices. Oracle was very happy to provide 24/7 emergency DBA services in case anything went wrong with any of the instances (local to the branch offices).

Just an additional guarantee of "if one of them behaves weirdly, we will be right on it" (as a service).

Unless you get a Postgres-based consultancy to do the same for you (and ofc they're not first party), that support is just unbeatable (in terms of what you're selling to your customer, the post offices).