What are the risks of arbitrum?

Could you elaborate on the potential risks associated with Arbitrum? Are there any security concerns or vulnerabilities that users should be aware of? What measures have been taken to mitigate these risks and ensure the platform's stability and security? Additionally, are there any financial risks, such as price volatility or market manipulation, that investors should consider before engaging with Arbitrum? It would be helpful to have a comprehensive understanding of the risks involved before making any decisions.