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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.
You shouldn't worry about this, as far as i remember ezinearticles and most article directories are nofollow, so no harm done. To back this up, i know 3 websites with tons and tons of links from article directories (like 10k or more) and nothing happened to them (no penguin or manual penalty).