Antitrust behavior != monopoly. This using it's lock on all iOS customers to force app creators to also use Apple's signin service. It doesn't have to have a monopoly, it's still an abuse of it's position. The app store itself is already under attack as anti competitive, this is just another extension of that behavior.

Antitrust behavior requires a monopoly. It’s part of the basic definition of antitrust.

And the comment was edited anyway. It originally did say monopoly.

Technically the right repair movement is to fight a company's monopoly on repairing a product. If Apple or company X requires you to use them to repair a product they have a 100% market value of repairing the said product. Technically Apple also has a monopoly on Web-engines by requiring a 100% market share of the one they make with-in the iOS infrastructure. Monopolies can existing with-in smaller percentages in the change of categorizations and more finite defintion. I monoplize your time is different than I monoplize your time at work.

They have a 100% monopoly on iPhone users. If your customers device is an iPhone and your product or service doesn't comply with their rules then your customer needs to either use a different device or not be your customer.

By this definition nearly every company is a monopoly. Despite the fact that me, a user, can ditch Apple and switch to the actual monopoly OS, Android, at any time.