Shutterstock Update: Creator Earnings?

At the end of 2017 Shutterstock had about 300,000 “active contributors.” In the press release put out on August 1, 2018 they said, “Since the launch of Shutterstock, more than 450,000 photographers, artists and designers have become contributors to our platform.” Since it is hard to believe that they added 150,000 new contributors in just six months, I suspect they make a distinction between “active contributors” and “all people who have ever contributed” in their 15-year history. We asked their PR department, but got no clarification.