Well, it's not just a game. This is an investment game. It all depends on which section the developers put the game in the app store. Clearly what is not in the game ...
Why do you think so? Google posted a "CryptoFlower" program in the casual section. Not in the sections of business or economics, namely in the game.
This is primarily a game, so is in the "games", and the fact that there is an opportunity to earn extra is just a nice bonus.