If you want to sell your overpriced chocolates, you're better off selling at Whole Foods rather than Walmart. Just because Whole Foods is the market that the wealthy prefer doesn't make them antitrust.
Market power makes it an antitrust situation and since you can't run a profitable app business without going through Apple, that certainly makes this a hostage scenario.
We haven't seen the last antitrust case against them. I'm certainly looking forward to them getting knocked down a few pegs. Only a stool pigeon would defend their behavior.