If Elon Musk were to create his own smart phone. How would it effect companies such as Apple, Google, or Samsung.

There is a news story out there that Elon Musk says he would make his own smart phone if Apple and Google ban Twitter from their app stores

Source: https://thehill.com/policy/technology/3750849-elon-musk-says-he-would-make-his-own-smart-phone-if-app-stores-ban-twitter/

Let's say it were to happen. How would this effect Apple, Samsung, and other phone companies. Could their moat be disrupted if Elon created this phone. Would Elon also owning Starlink help in this disruption.