Cas, no worries about banning. Those are extreme cases. The only folks that would have to be concerned about such extreme action are those who are a constant source of major problems and headaches for a cruise line. Those who use online sites and blogs to try and destroy a cruise line reputation distorting facts, spread rumors or lies, threaten lawsuits over frivilous things constantly and try to start petitions against a line should worry. Seeking the lowest rate for a cruise or even reporting a poor experience or the need for better guest relations efforts is a totally different thing. You're not one of the whiners, mooches or generally un-pleasable people who would ever be unwelcome on any line.