Another reason not mentioned here is advertising independent shore excursions either onboard the ship or even via social media. I knew of a couple who wanted to do a small group independent shore excursion not part of the Cruise Line’s offerings. They needed to find two more people to obtain the four person minimum and they found the two that they needed not realizing that they were undercover monitors of the Facebook page. They turned the advertisers in and they were kicked off the cruise. As to any banishment, I cannot confirm that but DO NOT advertise any independent group excursions onboard or even via social media as that is technically considered theft from the Cruise Line.
Im sorry, i have to ban you from my you tube and give a dislike. Im sick of you people blaming the alcohol. Its like me blaming you for people going to the bathroom cause you ate the food. Enough already.