Robinhood has more than tripled, but a sharp drop in Bitcoin's price can temporarily halt the rally.Robinhood (HOOD +0.17%) has been one of the top-performing fintech stocks in the market, comfortably outpacing the S&P 500 with its 222% year-to-date gain. Even with that rally, it's still down by more than 20% from its all-time high.Some stocks go into the new year better than ever and swiftly climb to all-time highs. However, other stocks lose their shine as revenue growth decelerates and more investors que ...