Leverage on music was much bigger because of the position that Apple had at the time, together with CDs not having DRM.

That was a unique situation that couldn't be replicated later for video and other media sadly.

Some cursory web searches reinforce an assumption I had: Amazon absolutely dominate the eBook sales market, with figures from 65-80% of all sales being indicated.

So how can you make the case that Amazon doesn't have "leverage" to negotiate DRM-free publishing?

> together with CDs not having DRM

I don't recall printed books ever having any form of "DRM".

In fact, Amazon does allow eBooks to be sold through the Kindle store without DRM, and many are sold that way. It's completely up to the discretion of the publisher.

Whereas I have many eBooks purchased years ago from Apple's store that I can only read on Apple devices, not on my Kindle.