For the record, "letting the market decide" is one of the fundamental underpinnings of the free market system, and is not a crime in any venue. so dumbest argument? Only if you don't believe in a free market.This has got to be the dumbest recurring argument, though there are a lot of dumb ones.
"Don't prosecute me for murder! That other guy is also murdering someone!"
The point I and others are making is the false indignation and outrage aimed at Apple for having a market based fee is nonsense. If you are really against 30% (assuming it is still not akin to murder), then just say so and apply it to all vendors equally. Amazon, Google....... I can't see any other marketplace where you can freely advertise your own products through the marketplace and circumvent the marketplace where you are advertising for free. amazon doesn't allow it, nor does Google.
I am presuming that you are aware also that Spotify and others can easily bypass the App Store payments by having customers sign up to subscriptions on their own web sites and handling the payments themselves? So fees: $0.
Should the market decide on a lower fee than 30%. I dunno, let the market decide. If it is too high, Google will lower theirs, then Apple will follow suit.
So "dumbest argument", NO, this argument is not the one that qualifies for that