Amateurs Rubi - Desperate

Another angle: "Rubi" could be a mistranslation or a term from a different language. Let me check the Spanish word "rubi" which means a type of red gemstone, but that might not be relevant. In Japanese, "rubī" could be a katakana spelling of "ruby," but again, not sure. Maybe it's a specific brand or product that's being used by these enthusiasts.