Per the judgement in the Epic case there is no smartphone operating system market, only a smartphone market of which the judge determined Apple had 15% marketshare globally as of 2020. Again if the product isn't sold or licensed, which in this case it is not, then it does not have a market. Don't take my word for it though, that's the words of the judge on the definition of "market". Apple does not compete in the smartphone operating system market as it does not sell a smartphone operating system, it sells a smartphone.