I think investors are getting nervous about Robinhood's bitcoin correlation, says Jim Cramer

After the close of Robin Hood reports, people are starting to get unnerved by how closely aligned this stock is with the price of Bitcoin. Even if today's dramatic rebound, Bitcoin still feels like it's lost its luster. The precipitous decline of the cryptocurrency occurring at the same time as a weakening dollar calls into question whether it's a real storehold of value or even a hedge against inflation.We know nothing. We we we this vol thing used we used to think it could be a currency. That's not obviou ...