I can't imagine anything worse than being a passenger on one of those (other than begin a low paid crew member who's been forced to remain aboard for the past 8 months)

Yes. I got dragged on one by my parents in the 1980s. I wanted to kill myself after about a day. It was like butlins with no escape and even lower standards of hygiene. It’s a profitable captive market to milk a load of people drowning their sorrows in alcohol and feed the slop in return. Why you’d pay for it I don’t understand.

Secondarily, good riddance to the whole industry.

Edit: after reflecting on this I don’t think my parents enjoyed it either. They went on it because it was the done thing at the time and they could tell everyone they went on it.

Add to that, that taking a cruise is just a superfluous luxury.