Well, more accurately, it'd be like Paramount complaining to Youtube about a Youtube channel that posts trailers before Paramount wants to release them, and Youtube shutting down that channel/user's account. Now, while we would agree that Paramount's one-day trailer policy would be stupid, it's still their property and their legal right to release trailers whenever they'd like.
And it's like that here. I think we can all agree that GW's one-week preview window is a bad policy for all involved. It's still their right to have that policy, because it's their content and they have the right to release it in the manner they see fit. Just because someone else decides to circumvent that policy and leak stuff early doesn't make it legally right (even though we all love seeing the info ahead of time).