This Open Source Software Was Used in Ukraine's Drone Attack on Russia

Or they're just rubbing it in. "Look here, we found these drones from local hacklab and threw them on a truck and it took out sizable portion of Russias planes over the weekend" -kind of way. All of that is pretty simple to figure out anyways, it's a huge PR victory to reveal everything (with the obvious military victory) and there's no easy nor cheap way for Russia to prevent that from happening again at somewhere else. Maybe next time it's not a truck near airfield but a van in Moscow or a tractor trailer at some field nearby training grounds. There's just no way Russia could monitor and defend everything across their country.