What are the downsides of BITO?

What are the potential drawbacks or downsides of investing in BITO, the Bitcoin futures-based ETF? Could the volatility of Bitcoin negatively impact the ETF's performance? How does the tracking error between the ETF and the underlying Bitcoin price affect investors? Are there any additional fees or costs associated with investing in BITO that could erode returns? Are there any regulatory risks or uncertainties that investors should be aware of when considering BITO as an investment option?