The biggest downside is that Robinhood only works in 16 states for cryptocurrency trades, but it plans to add more in the future. It is currently available in the USA and Canada. Coinmama is a registered money business in the United States, giving it additional legitimacy and recognition above some competitors. Cloud mining will almost never be profitable. Deposits can be made through bank transfer, SEPA transfer, international bank wire, and now even credit cards. Want to buy using Coinmama? This is further evidence to why Coinbase is a leader in digital currencies in the United States.