http://official-gomk.anonblogd4pcarck2ff6qlseyawjljaatp6wjq6rqpet2wfuoom42kyd.onion/p/anonymity-and-accountability
Furthermore, it can be difficult to track user behavior and identify patterns of problematic activity, due to the fact that users may go lengths to avoid detection. It's part of the reason why some anonymous groups are invite only, or require payment to join. In some cases, neither the groups nor their members hold themselves accountable, and their leaders may be in on the scam, or whatever.