[WooCommerce 3.0+] Custom terms and conditions link (external source)

wc-custom-tc-link.php

function custom_terms_and_conditions_link( $link ) {
    // replace link below with your custom terms and conditions url
    return 'https://google.com';
}
add_filter( 'woocommerce_get_terms_page_permalink', 'custom_terms_and_conditions_link' );

// This snippet can be used alongside https://gist.github.com/rynaldos/4993f8515580601856d51fccf974f8de (force terms and conditions to open in a new tab)