The activists and/or allies might get sued by Rowling and her publisher(s) (and whatever production company(/ies) that make her movies) would argue that the activists are stealing money from Rowling.
If they are right, Rowling suffers.
If they aren’t, it might undermine their arguments about copyright.
Either way, the political left (and much of the libertarian movement—the non-richies, in this matter) wins.
The activists and/or allies might get sued by Rowling and her publisher(s) (and whatever production company(/ies) that make her movies) would argue that the activists are stealing money from Rowling.
If they are right, Rowling suffers.
If they aren’t, it might undermine their arguments about copyright.
Either way, the political left (and much of the libertarian movement—the non-richies, in this matter) wins.