First off, they do NOT have that right, because that would be an illegal restraint of trade.
You don't seem to understand that the basic concept of a "free" market involves things like "no extortion." So if Apple had the monopoly on smartphones, and went to Best Buy and said, "Either you stop selling Windows PCs or you can't sell any smartphones," that is an illegal restraint of trade, and that we as Americans WANT exactly that to be illegal. We don't want anyone to be able to get to the top, monopolize it, and then stifle innovation or competition through restraint of trade. They ALWAYS need to be competing for our business and our capital.
We want fair competition on all products, THAT is how a free market grows and prospers.