A move being anti-competitive and it being against anti-trust law are not the same thing. You also need to establish that the defendant is improperly exercising

A move being anti-competitive and it being against anti-trust law are not the same thing. You also need to establish that the defendant is improperly exercising their own size/market-power to force the deal through which is a much higher bar. Also the FTC is not exactly known for enforcing antitrust law very strictly.