When you consider "monopoly" or "market unfairness" you have to look at it on the state level. I don't think anyone is complaining about Europe where Apple is in the minority of phones. I would assume we're talking about the USA where Apple does have outsized influence compared to other phone brands. We aren't talking about Apple vs Google. It's Apple vs Samsung/Google Pixel Line/Motorola/Nokia and their abuse of their status as the largest phone seller in the USA. Say iMessage policy being limited to the Apple platform as others have pointed out.