Exploitation of Skinner-Box techniques and pseudo-gambling lockboxes for real cash is all sorts of shady. No clue how Cryptic gets away with this in the US's strict anti-gambling laws (outside of Nevada) but w/e. Oh, and the game is open to anyone 13 years of age or older. So not only promotion of blatant gambling but also doing so to MINORS!?
That's because it doesn't qualify as gambling. It's not any different from selling packs of baseball or ccg cards.