Ironically this is the only reason Safari has the market share it does. If Apple didn't force its browser on iOS users, Chrome would dominate there too.
I am curious what the market share split is on macOS.
I'd be interested too. I can't find the stats atm but I wouldn't be surprised if it were around 50%. Still, my hypothesis is it mostly survives because of iOS. Sites must work with iPhones therefore it takes little if any effort for macOS Safari to be supported.
A more accurate description is that every browser uses WebKit, Safari's rendering engine.
Wouldn't this be solved if they would switch to Chrome as well? Note, I'm not saying they should. But this is exactly the kind of problem that a global single engine would solve. The same things could run on every device where that engine is available.
This is not really correct, since I'm writing this to you through Chrome on an iPad.
Edit: I stand corrected. I learned something about my browser today.