The law defines an operating system provider as "a person or entity that develops, licenses, or controls the operating system software on a computer, mobile device, or any other general computing device." If the intent were to target mobile vendors or app store vendors, I would be fine with it, but that's not the text. Of course it's the case that US lawmakers often write incoherent or extremely onerous legislation and then turn around and say, like, "Oh that's obviously not what we actually meant. We don't know what any of this stuff is, it just sounded good."