Amazon deserves a lot of criticism in the general sense, but this can only be seen as a positive move. Most importantly, if they set an industry standard, others might follow.
Fundamentally, I prefer a physical book to a digital one. But, the primary reason I'd never even entertain a digital book is the lack of ownership. Ownership is incredibly important, and we need to celebrate victories when they happen.
It's a positive move, but too little, too late. These same publishers have already been available DRM-free from other stores for a long time.
Why?
Genuine question.
What's to "celebrate?" This is like "celebrating" a ketchup company removing the rat hairs.
I agree this is a positive step, but this is like notch 1 on a scale of 0 to 100, 0 being maximum abuse of your customer. I think it's downright evil not to allow this for DRM free books, which they have been doing for many years now. It is positive that they reduced the level of evil by a little bit, and I'll give them credit for that, but this movement is so minor in the scope of things that it does not sway me whatsoever to go back to buying from their Kindle store