Tenure isn't the end of the road and tenured researchers don't work alone.
Tenured professors are often not the primary authors on papers -- their students and post-docs are and they need to get their papers into good (paywalled) venues. Moreover, they still need to convince people to give them money to hire students and postdocs. If you are a big kahuna, maybe you can get away with taking a moral stand and publishing in OA journals, but it's way easier to sell yourself and maintain your status if you publish where everyone else publishes.
I agree with what you say, but I do not understand why it is related to my comment. I was trying to say that refusing to publish in closed-access journals is hard, but refusing to review for them is easy.
Tenured professors are often not the primary authors on papers -- their students and post-docs are and they need to get their papers into good (paywalled) venues. Moreover, they still need to convince people to give them money to hire students and postdocs. If you are a big kahuna, maybe you can get away with taking a moral stand and publishing in OA journals, but it's way easier to sell yourself and maintain your status if you publish where everyone else publishes.