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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.
Since disqus comments are now being indexed... I would think they do hold value in the comment links. I personally think no-follow links do help sites rank organically. I know they don't pass page rank (green bar juice), but they do count as links. I would personally never turn down a good no-follow link on an indexed page.