There are several benefits, but compared to WordPress, I guess the biggest one is outreach: no one will actually see an article if it's published by a young researcher that hasn't made a name for themselves yet. It will also not be catalogued and will therefore be more difficult to find when searching for articles.
Also, calling researchers "whipped" is a bit dismissive to the huge inertia there is in the realm of scientific publication. The scientific journal of Nature was founded in 1869, but general open-access publishing has only really taken off in the last decade or so.
Gid det var så nemt for alle os andre, hvis vi lavede fejl på vores årsopgørelser 🙃