Thank you, very interesting.
Despite the reassuring tone, two of the things that "Maria Jose from Amazon.com" writes are (for what I know) false:
1) we are not allowed to close accounts unless the customer requests it.
(...actually Amazon seems to do just this if they decide that you did something wrong, according to their own criteria that you are not allowed to know)
2) And also I can assure you that we can not wipe out the content on your Kindle, that's up to you.
(...they already demonstrated, thanks to the infamous "1984" episode, that they can)