This is one of those cases where the good has to suffer because some folks didn't know how to behave.
On Amazon anyone can tag a book. The reader, author, publisher, etc. At the bottom of a book it has a place where you can tag the book with what you think best describes it. Back in the day this feature was used responsibly but now, it's gone to hell. I think it's unfair because all authors shouldn't be punished just because some misbehave. Some think this might be temporary but we have ot wait and see.
They say it's because Kindle authors were abusing the system. Apparently they were tagging other Kindle books (including those from commercial houses) to sabotage, etc. I think they weren't having the problem with print or either since most print books are from pubs maybe Amazon was afraid of messing with the tags for those books. Not sure but they were having a horrible problem with tagging in the Kindle author community.
I agree with Dana, they should punish the people who did this by deleting their accounts. They shouldn't punish everyone.
I heard it was the people attacking ebooks priced higher than $9.99. No idea what the truth is.
I also heard that only people who've purchased a book can now tag it, also that the tags don't show up on the book pages but are nonetheless in the system