What are the potential security vulnerabilities introduced by using free DDoS mitigation proxies?

Using free DDoS mitigation proxies can introduce several security vulnerabilities. These proxies might not have the robust security infrastructure of paid services, potentially exposing your traffic to interception or manipulation. They could also log your sensitive data, be used as a pivot point for further attacks, or fail to effectively filter malicious traffic, allowing the DDoS attack to reach your origin server.