But no one else would. You won't get the same level of support, features, or app compatibility unless you're willing to pay the salary of those who will make it possible, or you're able to find a niche group of people (eg. a million developers) to split the cost of making this possible. The OS duopoly is only a thing because making a functional & useful mobile operating system takes a enormous amount of human effort by some of the most skilled people in their fields.