Yes. Good point. Most but not all of my Nook purchases moved to Sainsburies but I don’t think any moved to Kobo but then I’d already read them. I consider it like most of my paper book purchases. Once I read a paper book it usually goes to a charity shop so it’s ‘lost’ to me anyway.
To gavin1. I agree what you wrote about ebooks from Kobo, Nook, etc besides Amazon. What I wrote was trying to challenge any assumptions people make when buying ebooks. Its seems to me when 'buying' (leasing) an ebook, I struggle with who really owns who. But, some people, because of convenience and simplicity, choose to give up that right of ownership.
Its still a few more steps, and not as easy as a Kindle, but then thats a selling point for Amazon the ease of use, and also importat to Amazon that Kindle user can easily buy more from them.
To be fair the same applies to books bought from Kobo, or any other ebook store. We have a pair of Nooks as well as my kindle, and when Barnes and Noble left the UK so did any way to easily buy books, Our Nook accounts moved to Sainsburies, and the to Kobo. There is pretty much no support from Kobo, and there no way to purchase and load books onto it over the Wifi, only by copying them over by USB, and Kobo too use DRM for some titles.
Calibre does automate the process. I find it painless.