Prevent backlink inject or something

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Hi all, could anyone kindly give advice how to block incoming backlink from shaddy site and remove current backlink spammer? all i could know is disable comment but they could still find a way. thanks in advance

https://preview.redd.it/ibkyvkq810ed1.png?width=1150&format=png&auto=webp&s=304dd01a63302a847981de06545bd4f9c56c6528

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