If someone declines an invitation to be in a collective, is it possible for that person to join at a later time? And, someone who asks to be kicked out cannot come back, once that is done? Does a collective owner have the right to throw someone out who causes trouble for a collective? I did not really see these items in the Q & A. These are not pressing issues for my collective, but I wanted to get some feedback about the functions of the tools given to collective owners.