It relies on a bull market, and increasingly, on cryptocurrency.Shares of investing platform Robinhood Markets (HOOD +2.20%) dropped 13% in November, according to data provided by S&P Global Market Intelligence. The company reported excellent third-quarter results, but it's been highly reliant on cryptocurrency trading, and many high-profile cryptocurrencies have been falling recently.More than meme stocks?Robinhood has evolved from a marketplace for speculative stock investing to a platform for...other typ ...