The part about who owns the slips can be complicated in the USA, too. The number of slips and moorings controlled by yacht clubs is probably much smaller than that controlled by commercial marinas
even in the USA.
Some clubs own their marinas
as well as the land where their club houses sit.
Some have leases on the land and/or harbor space from a government
entity, such as a port commission.
Some clubs are big enough that they have "out stations" with sometimes very limited facilities.
Some own their clubhouses (on owned or leased land), and have limited temporary space on courtesy docks, but do not control any long-term slips or moorings.
Some clubs have no slips but make business arrangements with adjacent marinas so they they can offer "reciprocal hospitality".
Some have club houses but no slip control or arrangements.
Some have employees, some have volunteers, and some are all-self-service.
Some of these without slips or moorings have access to dry storage
on their property.
And some are just plain old "paper" or "internet" clubs.
Some clubs rely on the commercial reciprocity directory and others don't bother to participate.
Some clubs rely on specific club-to-club reciprocity agreements or upon agreements brokered by a regional association.
Some have methods to charge the visitor's host club and some take credit cards or cash.
And this doesn't exhaust
all the possibilities!