I would argue, @dumb-news, that there are people ready to do some great things without a direct money reward, hoping to make the World a better place. For example Satoshi Nakamoto or Linus Torvalds. Yes, they are rich now, but when they have started their projects, reward was not guaranteed at all.
Aside of that, Durov brothers still didn’t give up the idea of Telegram’s cryptocurrency called gram.