If they failed all people who were "email trailed" then that would be close to the entire candidature for that module, I guarantee that.
As I work for a Big4, I always get forwarded this stuff, and yes the controversy was in the current module I'm doing now, but hey, they CA should blame themselves, they changed the quiz assessments from in-house to online. How could they possibly police people in a firm sitting in a meeting room and doing the quizzes together?