We really need a law/court case that establishes who owns data and who has permission to share it. The volunteers should be allowed to share whatever they want.
Facebook is essentially saying we're not allowed to talk to each-other ("in bulk") about what ads Facebook is showing us. Not the first time corporations try to prevent consumers/users/workers from organizing.
Scraping appears to violate the ToS. Tortious interference was brought up in the comments but I'm not convinced it applies.
Regardless of whether the scraping itself is legal, redistributing the content to a third party is likely to violate copyright in many cases.
The entire situation seems overly complicated.