The US anti trust legislation punishes the abuse of monopoly power, not being monopoly in itself. Google was found guilty in leveraging their dominating position on the platform to do just that.
On the other hand in the US Apple's App Store was not found to be a monopoly in the first place. Different cases about abusing dominating position also didn't go far.
On the other hand in the US Apple's App Store was not found to be a monopoly in the first place. Different cases about abusing dominating position also didn't go far.