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Why is Amazon AMS blocked

I added Have I missed anything from my list of web form best practices? to my Readability reading list, it gets sent to my Kindle (and displayed on the website) as:

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As requested, I'm contacting you. I'm contacted Readability, and pointing them to this question.

(I'm guessing they're using one of the clouds, and you've blocked those IPs. Just a guess. But while I can understand blocking editing, voting, etc. from random cloud VMs, shouldn't anonymous viewing be perfectly safe?)

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