That is a good point. Since every IP is a state sponsored monopoly, this leads to the state of the game industry. You don't add loot boxes to a new franchise, but to existing ones that people are emotionally invested in. For example, you might have competition in the genre of action RPG set in space, but Star Wars is a monopoly, and another company cannot legally make an alternative, so the people who want a Star Wars game are a more captive audience that can be maximally exploited.