If you don't consider telegram a well-done cross platform app, then what are your standards? There is literally no other app that is as X-platform as telegram. Nothing by MS, Facebook, Google, Apple or any other company in the world comes close to releasing an app for Every mobile and desktop platform. On top of that, Telegram is better in performance and offer far more features than competitors who release in fewer platforms... FOR FREE. There are so many more things to praise before thinking of any criticism about emojis not looking right before sending in Linux desktop lol.