This is not necessarily true. (I am a professor.) In general I would like to be able to refuse review requests for journals that rip off their (institutional)

This is not necessarily true. (I am a professor.) In general I would like to be able to refuse review requests for journals that rip off their (institutional) customers. Under the circumstances, I dare not do so, because these requests usually come from senior scientists in my field. However, if my university had such a policy (and it was conveniently explained on a web page I could link to) it would be very easy for me to back out of reviewing for these journals without taking the blame. Sure, some of my colleagues would continue to review for these journals, and the university would never know. But such a policy would give an out for individidual researchers who would like to support this cause.