A $10 app can be lost easily, phones are more prone to get broken from anything, whereas a computer only destroyed by floods, rage, overheating, or power surge, you can lose your apple id (if bought on an apple phone) you will lose the proof of purchase, you cant take the game from one phone to another unless you are using the same OS (ex. android to android, ios to ios) and not from one os to the other (ios to android) and many more reasons. I don't know why I wasted time commenting this, and before anyone goes "who asked?" I don't care who asked, $10 on an application is expensive. except for 9-year-olds with their parent's credit/debit card.