It's similar to the problem of security holes. Defenders have to find all bugs. Attackers have to find a single bug that the defenders missed. Twitter has to fi

It's similar to the problem of security holes. Defenders have to find all bugs. Attackers have to find a single bug that the defenders missed. Twitter has to find all bots. These researchers have to find a single (cluster of) bot that Twitter missed. It's a lot easier.