> All group members will see that the attacker has joined. There is no way to suppress this message. The only issue that I see here is that a large group may n

> All group members will see that the attacker has joined. There is no way to suppress this message. The only issue that I see here is that a large group may not see the user joined. People can ignore those messages over a certain threshold. However most large groups are not going to be as privacy sensitive so it is not really an issue.