Facebook has no business in dictating what plugins the users would like to have on their browsers. Sure they can ban scraping because reasons, but both this or the Cambridge Analytica case are not data-leak unless we are assuming that a user's personal data, contents they generated and their social relationship status are all Facebook's property.
Acadamic use vs commercial use is a separate topic too imho.
I agree with you that they have the right to deny service, and scraping at scale is not same as regular queries. Suggesting FB's react was meant to protect (not theirs) data is what I feel not about right, though.
Acadamic use vs commercial use is a separate topic too imho.