Follower-only chat enabled due to organized trolling

Got hit by a number of trolls in my stream a few days ago, 2 users banned as a result of their actions.  In order to stop the attacks on the channel, I ended up having to enable follower-only chat again; I don't like making users feel obligated to follow to be able to chat, but in cases where it's obvious the privilege to be able to chat in the channel is going to be abused, I have to put measures in place to stop it from happening...  Follower-only chat will eventually fall off provided the attacks have stopped.  There were 2 bans in the last stream due to trolling, so I set the follow minimum at 30 minutes.  It will drop to 10 minutes in the next stream (later today), then down to nothing provided there isn't any more situations during today's stream, being fully removed by the 3rd stream if no more situations present themselves by individuals looking to cause problems.