I was actually going for the opposite point - databases generally meet the definition of CRUD app. You create rows, read them, update them and delete them (literally SQL verbs INSERT, SELECT, UPDATE, DELETE). But they are highly complex pieces of software. People who program them are generally hard core.
I think databases are more of the development environment for such apps, rather than the apps themselves. C.f. how Electron apps are "just web pages shipped with their own browser", and yet a browser (and its JavaScript runtime) are significantly more complex than almost any app built in the manner of an Electron app.
