Because I don't really trust any of them, and I don't believe that the business is self-sustainable. At the moment we're in a phase where CTOs are able to withdraw money from the corporate bank accounts to be "on the cutting edge", but I don't think that's going to last. I'd rather have my money in something else.
Index funds adjust based on performance of the underlying stocks, so it doesn’t really matter if one of them does poorly. The index fund will adjust. When you buy an index fund like the S&P 500, you’re taking a position that the mega-caps it comprises as a whole will give you outsized returns over extended periods of time.