I think it is comparable. A ps5 is hardware. Sony is under no obligation to provide a 3rd party operating system, but they should also not restrict you from creating or deploying one yourself on the hardware you own. Fundamentally, this should also extend to running software from any vendor you choose (a third party App Store). Sony artificially restricts your choice to only buying from them, and only running firmware and software they distribute. This is not dissimilar from iOS or Android or other hardware vendors that lock you in and lock down your hardware.