Margaret Mitchell died in 1949.
The book was published in 1937, and this site thinks it's Public Domain
https://www.globalgreyebooks.com/gon...ind-ebook.html
The removal seems bizarre as Amazon said in future (after the George Orwell debacle, btw he died in 1950) they would only remove titles from further sale if an issue, not from the user.
It's not as if it's an illegally sold ARC of an unpublished novel by current author, but even then they should compensate publisher/author. It's gone when they have sold it!
It's THEIR problem, not yours, if they sold something they shouldn't have. A good reason to always remove DRM and make a backup. Always download not rely on direct Kindle "whispernet". In some countries Amazon's action would be illegal and it's up to them to pay damages or placate a copyright holder, as they retail. It's immoral and abusive to remove a sold and supplied digital good.
Even with counterfeit physical goods it's the seller that has liability. Product recall due to hazard is a different category and usually voluntary.