The famous example is the removal of George Orwell's 1984. Note that Bezos called it all kinds of things, but did not revert the change according to the article [0]
I didn't know about that, would have been right that Amazon pays damages to the copyright holder. But they did at least refund the price paid, so the readers were no worse off than at start.
Generally not a big fan of Amazon-world, but if you don't mind reading older books kindle is good value I think. My 30pence copy of Orwell's "Homage to Catalonia" was very good value, and has not yet mysteriously disappeared from my Kindles!
[0] https://www.npr.org/2009/07/24/106989048/amazons-1984-deleti...