Through my website`s contact form, I`ve been getting emails from link-building services offering "Amazon backlinks (DA 96)" -- saying something akin to "this has nothing to do with whether you sell anything on Amazon or not. We create a page for you and your website will be linked (to) on a dedicated page. This is a very strong do-follow link to your site."
A google search provides little info about this supposed technique. And Amazon`s TOS say you can`t link away from Amazon. So what is this, is there any validity to it?