AmberGran
I've read about a few people who do now. It costs them less than paying a mortgage and at least some of them work from the ship.
I've also read about people (Americans) who live in hotels. Some of the chains have apartments that are kept for visiting staff and if you ask you can apparently rent them out long term. Again people have found it cheaper than paying a mortgage. The hotels do the cleaning too. I don't think you can decorate or furnish the apartments, but you do get the use of the hotel amenities like pools.
My aunt worked in a local hotel and my cousin and I were sent to visit an old lady who lived there. She had sold everything after her husband died, and reckoned a hotel was preferable to a care home!
Now, we were about 16, and I remember the lady was interesting to talk to, as she had travelled the world with her seafaring husband, so visiting her was never a chore, but I don’t remember how we came to stop going. It also never occurred to us at the time how she would fare if she needed actual nursing care, say after being discharged from hospital. The self- centredness of youth, I suppose!