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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
Like Nigel said, pretty much the only reason I would ever aim to try and put something in front of my root domain name, would be because I'm trying to pass the domain off as something it's not. So whether that is affiliate links that nobody wants, or a federal prison sentence for taking Kali linux endeavors a little to far, is not for me to know 
It's coming back with 25 results and quite a few PDF files.