The fact that they're used for general purpose use-cases and the fact that they're hosting applications for a wide set of other businesses which are threatened

The fact that they're used for general purpose use-cases and the fact that they're hosting applications for a wide set of other businesses which are threatened by possible anti-competitive actions of platform holders. Xbox is a device that hosts video games and media services. A phone is hosting all those and hundreds of other use-cases, from banking and financial services, to hardware access via IoT interfaces, car integration and myriad of other applications.