There's nothing wrong with supporting iOS. What is wrong, however, is Apple's insistence on approving every single instruction iOS devices run, and this policy being realized in hardware. You bought the device. You gave Apple money, they gave you an iPhone. It's yours now, and it's no longer theirs. So why do they still retain any kind of control whatsoever over it? A new iPhone literally won't let you do anything before it gets an okay from the mothership.
It should be illegal for hardware manufacturers to hardcode public keys and hostnames into devices such that the end user can't change them.
Then tell your customers that your product won’t be supported on their shiny Apple hardware and ask them to buy another hardware from a different manufacturer.
But unfortunately Apple deliberately cripples these devices. Really hope the EU will overthrow these hardware-facilitated software monopolies soon. The truth is Apple already makes quite sizeable profits with the hardware alone, so I think at least power users should be able to install arbitrary software on them. This whole "the hardware can only run software approved by us" is so ridiculous, really makes you wonder how companies doing this (not only Apple) can still get away with it.
Imaging Tesla would restrict which roads you can drive your car on, because just using arbitrary roads that haven't been thoroughly reviewed by them for security and safety would be a risk to you. That's essentially what Apple is doing with hardware that's perfectly capable of running general-purpose software.
If you don’t like Apple’s approach or products, then don’t buy them and let the market decide. No company is under obligation to do business according to what you or I think is correct.
If you think the market for a good phone with open hardware is there, then by all means go ahead and build such a product. There is plenty of VC money these days.