add_filter( 'comment_form_default_fields', 'wc_comment_form_change_cookies' );
function wc_comment_form_change_cookies( $fields ) {
    $commenter = wp_get_current_commenter();

    $consent   = empty( $commenter['comment_author_email'] ) ? '' : ' checked="checked"';

    $fields['cookies'] = '
' .
                     ''.__('Remember Me!', 'textdomain').'
';
    return $fields;
}