Not really. If I'm a business and need to contact my customers and can just call them or text them on SMS or third party messenger platforms. Apple does not gatekeep me from reaching out to them. But if I'm a business and want to sell my customers an app, then Apple is the gatekeeper for the iOS platform, as I can't distribute my app to my customers with Apple devices any other way.

Similar with people. In EU nobody I know defaults to iMessages so it's not a big issue here.