The trouble with movements like Anonymous is that there is no centralized authority. Further, a group pushing for anarchy is either hypocritical if it's effective (because it will be organized) or ineffective because it's anarchical and disorganized.

Anonymous is not a serious threat to large corporations. It may cost them a minor inconveniencr, but without centralized authority, the group has no real internal integrity (the question of whether or not a group claiming to work under the auspices of Anonymous is moot...because anyone can be Anonymous).