Is Robinhood Crypto really zero fee bitcoin trading?

Could you please elaborate on the claim that Robinhood Crypto offers zero-fee Bitcoin trading? Does this mean there are absolutely no costs associated with buying and selling bitcoin on their platform? Are there any hidden fees or charges that investors should be aware of? Does Robinhood Crypto compensate for these zero fees through other means, such as higher spreads or interest rates on loans? Given the volatile nature of cryptocurrencies, how does Robinhood Crypto ensure that they can sustain offering zero-fee trading in the long run? Clarifying these points would help investors make informed decisions about whether Robinhood Crypto truly offers a cost-effective way to trade bitcoin.