Megacorps weren't always giants and it's not unusual for small companies to eventually become giants through excellent vertically-integrated products, and such companies would become subject to these regulations.
Interoperability is not free. One of the trades it brings is a notably lowered ceiling in terms of tightness and capabilities, and this persists no matter how many man-hours are poured into engineering the systems that enable it.
The Linux desktop is a great example of this at play. While it's technically worked for decades at this point, it's been a constant struggle to make it a high quality, thoroughly polished experience end to end and that's partly thanks to the unavoidable friction and gaps between layers that comes with interoperability and tens of involved parties.
Interoperability is not free. One of the trades it brings is a notably lowered ceiling in terms of tightness and capabilities, and this persists no matter how many man-hours are poured into engineering the systems that enable it.
The Linux desktop is a great example of this at play. While it's technically worked for decades at this point, it's been a constant struggle to make it a high quality, thoroughly polished experience end to end and that's partly thanks to the unavoidable friction and gaps between layers that comes with interoperability and tens of involved parties.