The fact that the same effect was sought to be achieved through a public statement by an official, executed by voluntary action of a private company, suggests a deep vulnerability of the checks imposed by the first amendment in the context of a public sphere built entirely of privately-owned infrastructure.
The first is that organized cultural minorities whose practices and preferences are granted legitimacy in the public sphere become potential claimants on a variety of institutional spaces and practices regulated by the state.
Sting still does annual concerts, but by and large as a cause - one of the first I ever noticed as a child growing up in the 1980s - has largely disappeared from the public sphere.