So I looked up Grayscales Bitcoin Trust and was surprised that they have an annual fee of 2%: am not sure if I understand this number correctly.GBTC currently has a market cap of about $21B. If Grayscale charges 2% of that, this would be $400M per year.$400 million for running a simple algorithm that buys/sells Bitcoin based on in/outflow of investors and keeping those bitcoins safe? This seems pretty much to me. Anything I am missing?