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
It's too hard to trust all those IPO's. It would be cool if someone had the exact data of % of succesful IPOs where the money goes to the right places, vs IPOs that end up in Bitcoin being stolen, which later on means Bitcoin being dumbed for some fiat.. Personally I trust way more David Irvine than I can trust Vitalik Buterin.