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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.
Its ok to do so , many seo companies put their site link in their client site's footer too!
Though, recently links in footer or other boiler plate areas like side bars etc do not get much value from Google. THough links in more prominent areas like top of the site of from text has more value
Hope that helps !