You cannot "prevent" cheating, you can at best mitigate it, it's a balance.
There plenty of way to mitigate cheating in game, but the game industry is focusing on the ones where they don't bear the cost and only the customer will (and this view is in part due to the model of F2P games, where banning cheater is useless as it doesn't cost them anything to create a new account).
Letting game developer having complete control and spying on the device playing the game is fine in a physical tournament were they provide the device, but it's insanity when it's the user own device in its home.
There plenty of way to mitigate cheating in game, but the game industry is focusing on the ones where they don't bear the cost and only the customer will (and this view is in part due to the model of F2P games, where banning cheater is useless as it doesn't cost them anything to create a new account).
Letting game developer having complete control and spying on the device playing the game is fine in a physical tournament were they provide the device, but it's insanity when it's the user own device in its home.