What is wrong with ICP?

I'm curious, what are some of the potential issues or concerns surrounding the Internet Computer Protocol (ICP)? As an investor or user, it's important to understand the potential drawbacks or challenges associated with this technology. Are there any scalability concerns? Are there any security vulnerabilities that have been identified? Additionally, what are some of the limitations of the network's decentralization and how might they impact its long-term sustainability? I'm eager to learn more about the potential downsides of ICP so I can make an informed decision about whether or not to invest in or use this technology.