I recognise that it may seem that I'm being overly pedantic but to me it seems that they are treating information like stuff when information does not act like stuff at all. I'm not one of these techno-utopian "information wants to be free" people, but at the same time we can't treat information the same way we treat stuff.
JSTOR should get that the rules have changed, if Wikipedia can build a competitor to Britannica then JSTOR can figure out how to provide (relatively) inexpensive access to the information that they are hoarding. Given that this is the very information that is meant to help us collectively build a better world for ourselves this needs to be done asap.
I don't doubt they sincerely regret what has happened - perhaps it will cause some much-needed introspection.