[Sporadic]

Again, for the last time, poor analogies of stores breaking into your house to retrieve bootlegged items and Amazon monitoring everything that is on is on your (nonexistent) Kindle are uncalled for.

3000+ books are added to the Kindle store every single day and anybody is able to upload material. Amazon can't possibly look at everything.

Some guy uploaded a darknet version of Ayn Rand's books.

When Amazon found out, they recalled the books and refunded everybody's money.

That's it.

This isn't Amazon searching every Kindle and deleting every book with that title.
This isn't Amazon deleting all of your warez darknet copies off of your device.
This isn't Jeff Bezos breaking into your house and stealing your children's Christmas presents.

All of these what if scenarios are just unsubstantiated fearmongering.

There has only been two instants of Amazon actually deleting files.

1) When some knucklehead uploads a pirated copy of somebody's story to the Kindle store.
2) Non-payment for Whispernet delivery/conversion in which case the files that were delivered are removed.

There have been multiple books removed for sale from Amazon's store for other reasons and they are still available to everybody who purchased them. For example, when Stephen King's The Stand was pulled for months, I was still able to redownload it. Same with anybody who bought Boyd Morrison's books for the Kindle store. Boyd pulled them but people who purchased them still have access.