It's called an IP address. Since some ISPs don't assign a fixed IP to a subscriber, a timestamp is nowadays necessary. The combination is traceable to a subscriber who is responsible for the line, either to work with law enforcement if subpoenaed or to not send abusive traffic via the line themselves

Why law enforcement doesn't do their job, resulting in people not bothering to report things anymore, is imo the real issue here. Third party identification services to replace a failing government branch is pretty ugly as a workaround, but perhaps less ugly than the commercial gatekeepers popping up today