https://www.pcgamer.com/destiny-2-was-the-largest-pc-launch-in-activision-history/

Destiny 2 is not without its troubles, but it has nonetheless been a big success for Activision. The company said in its fourth-quarter and 2017 year-end financial results that the space-wizard shooter was "the largest PC launch in Activision history based on units," and that its first expansion, Curse of Osiris, had a higher attach rate—that is, the percentage of Destiny 2 owners who bought it—than the first expansion for the original Destiny. 

Activision Publishing CEO Eric Hirshberg said during the earnings call that the launch of Destiny 2 was "very successful," and that it enjoyed "high levels of engagement  for the first couple of months post-launch." But he also acknowledged that Bungie's effort to make the game "less of a grind" than the original Destiny resulted in some expected problems.