A good example of what you're talking about is Telegram [https://telegram.org https://telegram.org]. > Telegram is supported by the Russian-born entrepreneur P

A good example of what you're talking about is Telegram [https://telegram.org https://telegram.org]. > Telegram is supported by the Russian-born entrepreneur Pavel Durov,[9] who is now a citizen of Saint Kitts and Nevis,[10] travelling the world in self-imposed exile.[11] Its client-side code is open-source software, whereas its server-side code is closed-sourced and proprietary.