I just wrote a paper which got published on Elsevier and my university has to pay 2900€ now, because I clicked „open access“
Note that I deliberately avoid calling the publishing racket a business, because these criminals-in-spirit and their empires produce nothing of value: they are lining their pockets by exploiting other people’s work, while those being exploited have no choice but to play into the publishers’ hand; enabling the publishers’ power brokerage further their encroachment on public information by gifting them the most precious fruits of their labor.