They have to be careful to make sure an update doesn't cause problems for users. It would be really bad publicity for them to put out an update that negatively affects all users to block a small subset of users from doing something Amazon doesn't like.
Most likely the costs outweigh the benefits. If Amazon's bottom line isn't greatly affected, it will likely be a low priority for them. So as long as the cracked books don't start showing up on the darknet in large numbers, and they don't start losing sales because of that, I don't see them spending lots of time on a fix.
In fact, I wouldn't be surprised of they saw a slight uptick in sales due to non-Kindle owners buying Kindle books to read on other devices.
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