[scarface74]

Everything you are saying is true, but when people talk about managed services, for the most part they are referring to someone else managing the VM, the operating system and the server application running on the VM - in this case the database.

[emn13]

Exactly! That's why I was confused - they didn't replace mongodb with colloquially "hosted" postgres; they stayed at the same level of (partial) hosting. I.e., they didn't "switch to hosted postgres", in any normal sense.