I think it's pretty clear from the readme that this is a humorous proof of concept more so than anything someone should seriously use.

True, but imagine this use case:

A messenger file with hardcoded settings and a hardcoded PGP key, stored on a USB stick.

You send a message.

Then you physically destroy the USB stick.

The client, the key, and the configuration are gone.

At some point the joke starts looking suspiciously like a dead-drop communication protocol.

How do you like that, FBI?

From the translated readme:

Macaroni Messenger is not a joke. It simply refuses to complicate solutions unnecessarily.

That's why some technical decisions might look like a joke.

Sometimes it really is a joke. But most of the time, it's just the simplest working option.

https://news.ycombinator.com/item?id=48487542