Way too difficult and rife for abuse. First, we don't really have static IPs, not even static prefixes on IPv6. You could narrow someone down to their city by

Way too difficult and rife for abuse. First, we don't really have static IPs, not even static prefixes on IPv6. You could narrow someone down to their city by their host mask, but that can still be any of 5,000,000 people. And all they have to do is change their MAC address and renew their DHCP lease to have a new IP. Second, easy to submit faked screenshots to get someone flagged as a bad person. When you get (in)famous enough, trolls start using false flag operations against you. Best bet is probably a service where registration requires absolute proof of ID (Facebook's "I pinky promise I'm really $madeUpName" isn't enough.) But that still has issues with stolen logins, tricking the registration system, the harassment having your real identity known can cause, and it would keep away decent people who value their privacy. This is why we can't have nice things.