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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.
If you find the directory useful as a user then it's safe to get a link there. If you wouldn't use the directory yourself it's best to just steer clear of it. I can't imagine many situations in which you would want more than 10 niche directory links because there just aren't that many quality directories any more.