When I got a kindle (10 years ago) I did it on the basis that it was possible to strip the DRM of the books and load them on another device. I'm not going to be tied to some shitty platform for ever more. I must say though that when I have bought books on other places, the process of stripping the DRM and getting the book onto the device has been an absolute ballache - presumably the same for any device when you're not using the native store.
I won't be going back to physical books though. I bought a hardback for the first time in ages and my wrists don't like it. Nor does my partner when I'm reading while they're trying to sleep.