You don't need them, but they make things go much faster, and some people prefer to remain anonymous. Proxies are also strongly advised for anyone who owns a VPS. Your account may be banned if your provider receives too many complaints about the IP address. However, whether or not you receive complaints is dependent on how you use the tool. After all, it is still a tool that can be used for good or evil. We are not liable for what you do with it, but we strongly advise you not to spam with it!