> What is the advantage to those organizations to have their work preserved?

It becomes a research resource. It also creates a high-friction interface for potential subscribers.

I wound up subscribing to Le Monde Diplo because of a HN comment referencing a paywalled article. I didn't want to sign up just for one article. So I bypassed using one of the circumvention sites (I think outline was popular then). The article was compelling enough that I signed up for the paper, and remain subscribed to this day.

Chomsky one time was talking about, gosh, his eyes are too old to be reading this microformat thing with a magnifier at the library in order to research archived newspapers like The (New York) Times. (This was sometime in the 90’s.)