I think it's a very American perspective to see this as black or white. You should be able to tell something is wrong by looking at what Apple is doing. Looking at how Fortnite operates does not give me the same feeling. Obviously Fortnite as a platform is not the same as iOS as a platform, and holding monopoly positions for each yield completely different outcomes. They are not equivalent.
Regulation is a blunt tool - it not enough to just feel they are not equivalent. Any law that may apply to Apple will apply to everyone else as well. The American perspective is that the government should not pick and choose winners