Making money from merely owning things that others need and have to pay you to use as they can’t get them otherwise (because you and people like you took them first) - something know in Economics as rent seeking, though it doesn’t apply only to housing - is pure parasitism because that person is producing no value whatsoever, merely extorting money from others because they removed free access to a resource from them.
Here’s some “” that fell off your post.
I think they were hanging around the word civilized.