How does StoneCastle make money?

Could you elaborate on the revenue streams of StoneCastle? Are they primarily dependent on investment fees from managing digital assets, or do they also generate income through other means such as trading, lending, or offering financial services? Additionally, how does their profitability compare to similar cryptocurrency and finance firms in the industry? Lastly, have there been any notable changes in their revenue model or profitability over the past few years?