What do you mean here by free? Can you play this without paying for the game itself? Along those same lines, GTAO isn't free, though its often described as such, especially by marketers who gain advantage by subverting language.
The real devil's advocate example for me is the microtransactions in Mass Effect, Garden Warfare and Halo 5 where those packs go hand in hand with free multiplayer maps and modes and continued development. That at least has a positive spin to it, because that revenue subsidizes development while providing a steady clip of new content to the entire playerbase, rather than the usual split of the community into various DLC haves and have-nots. I'm still torn on the concept overall because I don't want grinds in every game, but its the best of these models we've seen to date.