I guess this is my disconnect or naïveté, but I thought the whole point of crypto is that it’s fairly traceable - obviously, there’s no decentralized way to add

I guess this is my disconnect or naïveté, but I thought the whole point of crypto is that it’s fairly traceable - obviously, there’s no decentralized way to address fraud, but couldn’t we have a decentralized report system that can warn people before sending tokens to known malicious actors?