HBO knows the benefits of pirating. For many of their shows, they tend to be very lax about allowing trackers and streams for the first episode of a season, but then militantly take down everything for the second episode. Of course you can still find episode 2 if you know where to look, but the point is it's harder. They want people to view the first episode and get hooked, and then pay for a subscription when they can't find the next one.