GP asked "why software makers should share their revenue with Apple" and said "nothing else" is like that. I was just pointing examples of things that were exactly like that.
As for the why: I'm thinking from the point of view of a developer. For me it's all the same. Paying 30% to Apple is the same as paying 30% to Steam or x% to console makers. In practice it doesn't matter if the appliance the user runs my software is essential or not, or if the store is exclusive, or comes preinstalled or not. I'm still paying a percentage to someone.
Well, I don't think paying 30% to Apple is the same as paying 30% to Steam. The former is mandatory, the latter is not. If you don't want to be on Steam, you can put your game in the Windows store/etc, or sell directly from your website. If you don't want to be on Apple's app store, well, too bad, it's the only way to reach 50+% of your potential customers (in the US).
I know quite a few people on Steam who simply refuse to but any games on any platforms other than Steam. Steam isn't an exclusive choice, but there's a nontrivial number of gamers who are loyal to Steam to the point of refusing to purchase anything that isn't available on Steam.
I personally have platforms I simply will not use (or refuse to spend money on directly, like EA's Origin, where I only own/care about C&C) regardless how good of a deal it is.
Valve has the ability to set whatever rules they want within their store. A world where we didn't allow this would get very complicated very quickly. Do we also make Walmart and Target carry every brand? How much are they allowed to markup the price? Who decides?
If Steam provides such a valuable service that consumers aren't willing to shop anywhere else even when they can, then that's what it is.
And, I think that's what would largely happen on the iPhone anyway if side-loading was allowed, outside of extraordinary circumstances like when protesters can't access a critical safety app. But, in order to keep apps on their store, Apple would have to make a (slightly) greater effort to keep developers happy.
(I also think Steam zealots are ridiculous, but that is a separate discussion.)
There's another option to sideloading... permitting other marketplaces to exist. They ban that, too. Both sideloading and alternate marketplaces have an impact on android and windows (non-steam markets). Why wouldn't such things have an impact on iphone?
In theory, yes. In practice, not publishing a game on Steam will also alienate you from a large amount of potential customers. We're only starting to see change recently. But I understand your point and agree in principle. What's your opinion on consoles, though?
As for the why: I'm thinking from the point of view of a developer. For me it's all the same. Paying 30% to Apple is the same as paying 30% to Steam or x% to console makers. In practice it doesn't matter if the appliance the user runs my software is essential or not, or if the store is exclusive, or comes preinstalled or not. I'm still paying a percentage to someone.
Sucks in all cases.