The only thing I can infer from this comment is that you aren't arguing within a legal framework (although I suspect you might be wrong because "unfair competitive advantage" is something that can be enforced under US and EU law).
Especially if we consider the difference between the intend behind a law and it's current legal interpretations.
Because of this I try to avoid arguing using the actual laws.
I also believe many of this laws need some degree of adaption to the modern world. Sometimes with changes in the law and sometimes with changes in the interpretation of the law.
So yes it's no accidentally vague.
More concrete would be : It should be illegal but might not be due to the law not being adapted to the dynamics of many modern markets.
But that's still pretty vague tbh.
And of course opinions differ on the good and bad aspects of their policies.
It’s not like all the competitors who are complaining are ‘fair’ in any particular way.
Also, your description fits a department store, or Amazon, or pretty much any other store for that matter.
All store owners get to stock what they want, charge what they want, and give their own products advantages.
If your argument is that no store should be able to do these things, then that seems like a reasonable position to hold.
Perhaps we do need to overhaul the notion of marketplaces and intermediaries in general. That seems like a relevant idea to explore.
The people arguing about monopolies are saying that everyone else should be allowed to do these things, but not Apple because they have too much power.
People don't realize what's actually going on with the policies and practices of the app stores. They just buy the phone and use it. If they did know, they would probably be more opposed to it too. They don't realize how these practices actually impact them and their choices on the platform.
I think plenty of people might think on reflection "That's not cool but I still want that phone".
That pretty much sums up my continuing commercial relationship with Google as well.
And my feelings about most modern meat production practices.
We don't always vote with our wallets.
Wait, how can what Apple does ever be okay even they legally don't have a monopoly.
Apple provides a marketplace (which they name store, but it's a marked place not a store) which is the only way to install software (on their phone) for millions of persons which means it's a marked and not just a marked place and they do both run the marked and provide products there but give their products an unfair competitive advantage (access to internal APIs, fast review, not applying app guidlines, subvention developent for the apps etc.) while haven basically rip-of pricing for (at least part of) the competition and intentionally preventing many business model and undermining how companies can freely present their products and company to users inside of their own products...
Not sure how anyone can call it ok, tbh.
Maybe legal due to a laws not yet having arrived in the 21st century but definitively not ok.