Kleros posted about what it calls the most expensive way to learn how optimistic governance works — or the most profitable, if you are the reporter raising the alarm. The post (with link) appears to reference an incident where a reporter surfaced a flaw in optimistic governance design.
Kleros
A decentralized arbitration protocol for disputes in the #web3 economy. Settled 1200+ disputes and counting! We're Hiring! http://kleros.io/career