This is the problem. It doesn't matter if they used those specific assets to perpetrate these specific acts. The overall market power derived from those assets (and many others) taints everything they do.
There is no way to effectively curtail monopoly power by selectively limiting the actions of monopolists in certain specific domains. It's like thinking you can stop a rampaging 500-pound gorilla by tying two of its fingers together because those were the two fingers that were at the leading edge of its blow when it crushed someone's skull with a punch.
Once a company has monopoly power of any kind, it is useless to try to stop it from using that power to do certain things. It will always find a way to use its power to get around any restrictions. The problem isn't what the monopoly does, it's that the monopoly exists. The only surefire way is to destroy the monopoly itself by shattering the company into tiny pieces so that no entity holds monopoly power at all.