I pressed "Keep off"

Isn’t 500 a http error?

Internal server error: A generic error message, given when an unexpected condition was encountered and no more specific message is suitable.

A misconfigured server isn’t really dystopian.

A temporary server error while trying to save settings to a server is not dystopian

Nah

Backend Dev here. 500 is an HTTP sever response, so requires a working connection to happen. If the app isn't connected to the network, in almost all cases, you would experience a different error, such as connection timed out, but not a 500.