I can easily see people attacking the servers.
Maybe not to the degree that it's causing all the issues they are attributing to attacks, but still to some degree.
And I'd bet most of the attacks are from the "It has DRM, so I won't bother with it" group, who again instead of actually having nothing to do with it either try to pirate it or attack the servers out of spite.
Not that it matters to me, since I have NO plans to ever touch any of these games unless the DRM is removed.
Even then, only PoP might get a purchase, on sale, with the DRM removed.