It just looks like a funny slop project if you read the English readme, but reading the Russian PHILOSOPHY.md [1] (auto-translated [2] if you don't read Russian) makes you realize that there's probably something more than "let's implement a messenger using git remote as a storage", knowing how popular messenger apps are getting blocked in Russia.
[1]: https://github.com/vanyapr/makaroshki/blob/main/PHILOSOPHY.m...
[2]: https://github-com.translate.goog/vanyapr/makaroshki/blob/ma... (Google Translate)