Ethereum is a great example and a great startup.
What these guys do is amazing, I'm a bug fan.
i'm not too enthusiast about their work, there aren't so much progress, they are still there, and one does wonder why they are still there when they received a shittons of money and didn't do any progress since months. I'm not saying they are scammers, or it is a farce to run away one day with even more money, but their work right now look only a bit promising, when you compare it at the big hype that there was at the beginning of their project