Remove default link to media file when adding to WYSIWYG editor in WordPress

functions.php

<?php
/**
 * Remove Link When Adding Media
 *
 * Adding media to a WYSIWYG editor can sometimes automatically include a link
 * to the file. This sets the default behavior for all users to none.
 *
 * @return void
 */
function prefix_media_linking() {

    $setting = get_option( 'image_default_link_type' );

    if ( $setting !== 'none' ) {
        update_option( 'image_default_link_type', 'none' );
    }

}
add_action( 'admin_init', 'prefix_media_linking', 10 );