Nobody buys an iPhone, iPad or Mac just for gaming. You seem to be focusing on only new users and buyers and forgetting the current customers. It's about the huge user base and potential profit for game devs. It would be foolish to ignore billions of people just because it's cheaper to buy a PC, console or Android.
Here are some iPhone
stats. There are over 1.5 billion active iPhone users in the world and Apple has sold over 2.24 billion iPhones. Add to that millions of sold Macs and iPads each year. All using Apple Silicon. Even if your game would be expensive to port to Mac alone you could first port it to iPhone/iPad and make good profit and then easier port it to Mac since they all basically use the same HW architecture. Feral has done some excellent AAA ports to iPhone, like Alien Isolation. The potential is huge but many devs want rather make money on microtransactions on the mobile platform than developing for Mac. That's why many don't even allow their iPhone games on Mac even if it would work just fine.
You should see what I said on the 997 floor. I mean that no one bought IOS just to play AAA games. This is not the purpose of the invention of the mobile phone. The purpose of the mobile phone is to call and SMS. I don't want to repeat it too many times. One billion people haven't transplanted the value of AAA games, because playing AAA games with IOS is a very bad experience.
At the same time, I see you mentioned that some game companies are planning to migrate to IOS,
Even if the transplant is successful, it is also a bad picture and bad content. It is like that Wizard III successfully transplanted to the switch, but castrated a lot of content (greatly castrated the resolution, material, texture, vegetation, shadow, water, light and other image performances). It is not qualified at all, because it can not open the highest picture quality, all special effects.
This is a complete joke.
Maybe all you see in your eyes is: Oh! This game is on the IOS. It's great. IOS can play AAA!
In addition, how do you know that the mobile phones used by previous users are the latest version? Are they the best hardware? Can they run AAA? I have great doubts.