McDonald's can be allowed to have 100% marketshare inside of McDonald's - cause they aren't a monopoly or duopoly for burger restaurants, and there are no similar entry barriers to selling burgers. Similarly, they do not present a monopsony to companies that are selling burger meat, buns or chicken nuggets.So, by that same argument, McDonalds has 100% marketshare inside of McDonalds.
Whereas there is a lack of competing smartphone operating systems - and they have a gatekeeping role towards other business users (developers).
👉 They are not the same and do not have or are subject to the same market conditions and monopoly power.
That's why it's reasonable to regulate one (smartphone OS/stores) and not the other (fast food restaurants).
I'm not changing my argument at all on this.