the problem with having consumers take action is that they are completely shortsighted and will take the path of least resistence - a path that the companies will have charted out to make this transition as smooth and painless _for the consumer_ as possible while retaining as much monopolistic power as possible.
There needs to be public institutions with the backing of the state to enforce property rights, including purchased devices.
To offer a modest counterweight here, every iPhone owner bought the product knowing damn well that Apple keeps the OS locked down. If you don’t want that, don’t buy an iPhone. There’s no confusion about what the product is and what you can do with it.
So how is a 3rd party going to give support to a customer with iPhone, if Apple will ban such 3rd party for whatever reason?
Let's say that given 3rd party is making a device, which can be controlled via Bluetooth from Windows, Android, MacOS and iOS. They don't make any money on any applications, but from the device.