Is my income tax a price the government charges for providing roads, schools, and protection? Just because there are services rendered doesn't mean it's not a tax.
There is no opt out, and price is a function of earnings rather than value added.
I can not do business in the US, or I can not do business with iPhone users. My only 'opt out' is to quit doing business in their market. I continue to see similarities here
You're right that it's more of a difference in degree and not kind. That said, the difference in degree is so vast as to be consequential. It's trivially easy to switch phone platforms (in the last 7 years, I've flip flopped between Android and iOS twice). In contrast, it's extremely difficult and disruptive to uproot your life and move countries; and that also presupposes that the destination country is willing to accept you.
In business terms, however, it's much easier to target consumers of a different country than of a different App Store. Even if you blacklist the top two countries, US and China, you still have a lot of consumers largely in India and Europe to buy your product. If you blacklist two major app stores it's effectively impossible to make money developing apps.
This isn't bad for consumers, it's bad for producers.
In that sense, I don't think you can opt out of the "Apple tax" because there are exactly 2 platforms both of which you have to be present on, otherwise you're not gonna reach your users.
But that’s exactly the point. You pay it because they have something you want. You can say they shouldn’t be allowed to gatekeep their markets but that’s a separate thing. Taxes you have to pay even if you don’t want the services.
There are tons of things that are paid for on a percentage basis, and the "is this value added or not" line is pretty difficult to define clearly.
It doesn't make sense to think of it as a tax, really, sure taxes can be used to provide services (or other things) but the fee being paid here is directly tied to the service you are receiving. If you want to draw parallels with government, it would better match a toll road or bridge; you can still argue the total collected toll doesn't fairly match the cost of providing the service, but the mechanism is at least clear.
Regardless of how hard you try to justify it as being similar to government tax (which you go to jail for not paying), the fact is that calling it the "Apple Tax" is an editorial decision used to paint it negatively. Now, you may support calling it that (or not) depending on how you feel about Apple. But let's not pretend it is the appropriate, unbiased name for it.
There is no opt out, and price is a function of earnings rather than value added.