I agree that you should own the data that was created because of your interaction with the device, but I do not agree that the reason is that you own the device

I agree that you should own the data that was created because of your interaction with the device, but I do not agree that the reason is that you own the device. Here's an example: You go to the library (or a privately owned web cafe), and write your stories there. It doesn't matter that you don't own the device. It's still your data.