That is a very north american definition of insurance. But insurance companies are not collectives. They are for-profit corporations, probably with a PO box in Delaware. Buying an insurance plan isn't like moving into a commune. It is a risk-shifting arrangement with a corporation, a formalized financial hedge. When I buy insurance I don't much care about other customers. They aren't part of my transaction. Maybe I am the only customer for a product. That does happen. It doesn't impact the obligations of the parties.