Their games and systems tie into huge gambling operations on 3rd party sites

If you have 30mins for a video I recommend People Make Games' documentary on it https://www.youtube.com/watch?v=eMmNy11Mn7g

Loot box style underage gambling in their live service games - TF2 hats, counterstrike skins, "trading cards", etc etc

Lootboxes comes to mind.