The issue here is that there's no competition if you want to reach Apple customers.
When you buy a fridge, the manufacturer can't forbid you from buying eggs for it.
You can go to another manufacturer, as a customer, if this really bothers you... But the guy selling eggs has virtually no recourse. In addition, he has no negotiation power. His eggs might only be stored inside that manufacturers fridge, too, so the lock out from that customer market could destroy the business!
As for regulations... Who's regulating internet browser? The only regulation is that your OS can't forbid alternatives or actively block or hamper their installation. That's worked reasonably fine. We don't get that with app stores on Apple (though Android does, for the most part)
A better analogy is I produce aftermarket software/hardware for the refrigerator and want to force them to accommodate it (with the govt stepping in to determine which kinds of features they can and can't add on their own, e.g. browsers) and even sell it to customers for me.
As for your last question, the browser is the regulation. It is a very specific software product. In the case of apps, there is an open-ended range of function. Regulators must determine in detail which of these are to be protected. Presumably they must allow apple to block some apps like (easily-categorized) malware, but what about borderline and controversial decisions based on quality or ethics? Regulators are now deciding the detailed functionality of the product and preventing apple from differentiating their product. Shouldn't consumer choice be the deciding factor instead?
And as for browsers, again Microsoft was supposedly a monopoly. Not just their own niche store, but most of the entire market for OS's.
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Arguably Android is also monopsony.
If your want to sell on the east coast (Apple), you need to put your product in wooden boxes no larger than X and documentation must be written in French, and you must have 10 employees that speak French.
If you want to sell to the West coast, you put your product in plastic bags, and everything is in Spanish, and your employees need to speak Spanish.
Yes, you have two competitors, but reach had a unique customer pool, and each had the sole power to let you access them. You must build your product and hope they purchase it (and keep it around), otherwise your business doesn't exist... You can't sell your product to anyone!
You have no negotiation power, if you're not promoted in store you can't leverage your power as a seller (they have all power, as long as they do not violate any actual law)