I've been hearing that Destiny 2 is doing rather poorly with reputation amongst its players, finding some way to anger its playerbase with just about every patch, I remember the ridiculous scandals involving last year's Christmas event, and some of the things just a bit after that too.
Maybe they're giving away D2 just try and inflate the playerbase a little, hoping a few people are curious enough to try it out, hoping a few of them will get hooked on it enough to actually buy things through the eververse and thus make some money?