They require technical skills and knowledge to set up and maintain, and may not be suitable for beginners or casual traders.
They may not be able to cope with sudden market changes, such as flash crashes, hacks, or regulatory actions.
They may be vulnerable to security breaches, bugs, or malicious attacks, which could result in losses or theft of funds.
They may incur high fees or commissions from the exchanges or platforms they use, which could reduce their profitability.