What matters the most in investing is the time when you exit. Loss or profit depends upon when you exit. If you can identify the bubble bursting, you can safely walk out of the market well before it happens. The tricky question is how to identify the market before it's blowing up. Investors, who made and lost money in dotcom bubble, fear that history may be repeated for the current tech bubble though the damage wouldn't as much as it was in dotcom crash.
Unicorns are defined as startup companies that are valued at $1 billion or more. It takes a lot to reach the unicorn level, yet some companies have done it faster than the rest.