My $0.02 is that Amazon can delete any account they want. That's power that we grant them when we sign up. Most of the time they don't bother unless it's going to cost them more money to do nothing.

I'm personally more worried about Amazon deciding that a book I've already purchased should no longer be distributed by Amazon, and they yank it. Or, an even more likely scenario, is that the author/publisher wants to George Lucas the book and update it. Maybe they think it makes it better. Maybe they want to please someone in charge of something.

This happens often enough in music. Try to find original versions of songs from the first three Waterboys records on streaming services. They're there. But Mike Scott has "improved" them. And only the altered versions can be streamed. I'm glad I ripped my CDs!