[31reasons]

>>Imagine an ETF that pools shares in pre ipo stocks. Now you can take the positions that the unicorns are over priced and short them. This should give us much better insight into what the entire market thinks these startups are worth.

That goes against the practice of "pump and dump". Investors who invest 50mil+ and raise valuation to billions and sell the company to Googles of the world not going to like your idea. They might do anything in their power to stop it.