It's been a year since Destiny 2 released on PC. To celebrate, Activision and Blizzard have bestowed one helluva gift upon us to celebrate. You can claim a free copy of Destiny 2 on PC. As far as I can tell, it seems like it's permanent access to Destiny 2 as long as you claim it before the 18th.
So get your free copy while it's hot folks, you've got until November 18th to claim your own copy. Even if you don't actually intend to play it then you might as well add it to your battle.net client anyway. Free stuff is always great, right?