Money and wealth is such a weird phenomena. It's a shared delusion and fiction between those who have the power to enforce said fiction through violence, but really, it doesn't actually EXIST. If everyone stopped paying their rent and mortgages, their houses and apartments don't go anywhere. Doctors' knowledge and skills don't disappear. The power plant or water treatment facilities don't stop working. They're all real and actual things.
However, in countries where they actually have nationalized those things, the wealth owning class will do everything both legal and less than legal to sabotage the continuing existence of those real physical facilities and the continuing work of the people with those skills.