In most jurisdictions around the world (including the US under the Computer Fraud and Abuse Act, and the UK under the Computer Misuse Act), unauthorized access or attacks that deny service to legitimate users can result in severe criminal penalties, including fines and years of imprisonment. The official DDoS-Ripper README includes a strong warning:
DDoS-Ripper does not rely on raw bandwidth or sheer packet volume. Instead, it uses a more subtle technique. The idea is to create as many connections as possible with a target server and keep them alive, holding them open by sending partial or "trash" HTTP headers. termux ddos ripper