At some level, it’s because each platform costs a lot of money. If a game is not available for your platform, it’s super expensive to get another platform. So other platforms having fun games your platform doesn’t can mean losing out— either you won’t get to experience the game, or you’re going to have to shell out, and either way hurts. Thus, it is actively in your best interest if the other platforms fail, thus encouraging devs to spend more effort on your chosen platform.
You’re being downvoted because there is contemporaneous historical evidence for their existence as people who existed and had a large following at the time, and in fact, as much or more evidence exists for them as exists for a lot of other historical figures. You can disbelieve claims about them, but it isn’t particularly rational to disbelieve they were actual people that attracted crowds. Likewise, it would be irrational to call Uri Geller a fictional character, even if its rational to disbelieve he had psychic powers.