Eh, nonprofit professional societies are the more natural home for journals, and many already do have journals. They're less likely to be partial to a particular institution than if universities ran journals. Their revenue also goes back into the community via services for early career scientists and grants.

But nope – not even a mention of Diamond Open Access, not in the article and not from the interviewed people apparently.

"Mutual benefit" my a**e.

Academics are apparently just stupid.