/* Disable Links in WordPress Comments */
remove_filter('comment_text', 'make_clickable', 9); By default WordPress automatically adds hyperlink to any link in the comment section. This behavior is enabled to make commenting for viewers an easy task. It lets us and our viewers to simply click on the link instead of manually copying and pasting to our web browsers.
However, this WordPress feature is widely used by spammers to post links in comment form. Use the above code in your child theme’s functions.php to completely disable WordPress from automatically adding html tags to links and making them clickable.
To avoid spam, you should also Remove the URL fields (Website Field) from the comment form.