Buying it through the Humble Store will get you both DRM - free copies of the game for Windows and Mac in addition to a Steam key (which also nets the Windows and Mac versions). (goingloudstudios.com)
Hacking teams are offered challenges inspired by Watch Dogs 2, with the winners receiving free copies of the game. (alistdaily.com)
MS gave away free copies of games in Europe at launch but showed no love whatsoever to their biggest fan base in America and they're doing it again. (n4g.com)