Sorry, but even Apple, who develops its own operating system, didn't develop it own system from scratch(1). The iOS platform is an adaption of this as well, meaning it is not a unique system.
One of the challenges of creating a startup is building a business which not only provides solutions/products to customers, but also works with other businesses. Attempting to cripple competitors platforms will quickly and easily be interpreted as monopolistic behavior(2).
1) Originally Mach 3 to Xnu and GNU and *BSD system utilities with only a proprietary layer on top, Quartz.