>However hard it is, you have all the rights to run whatever you like on your device you purchased.
This is patently false. Many entitlements are locked behind explicit, human approval from the Apple Developer Program; examples include NFC with payment-related Application IDs and Multicast Networking. You actually have to submit a request that basically goes 'Please can I write software for this device?' to use that hardware on the device (see https://developer.apple.com/news/?id=0oi77447). You emphatically are NOT able to run 'whatever you like'.
However Apple can lock their software. The software is licensed, you don't buy that but licence it like Photoshop. Adobe also doesn't provide you with an easy way to do your taxes on Photoshop but I'm yet hear to claim that Adobe is preventing us from doing our taxes.(I couldn't think out of my head a major software that's not on subscription model, hmm)
Remove it and install something like Android on it, it is hard but it has been done before.
I simply don't see how Apple is obligated to make it easy or create tools for doing it. It's not promised upon purchase or on any advertisement materials.
It's not different than complaining that Apple does not let you use your phone as pocket heater through heating the Qi coil.
This is patently false. Many entitlements are locked behind explicit, human approval from the Apple Developer Program; examples include NFC with payment-related Application IDs and Multicast Networking. You actually have to submit a request that basically goes 'Please can I write software for this device?' to use that hardware on the device (see https://developer.apple.com/news/?id=0oi77447). You emphatically are NOT able to run 'whatever you like'.