woocommerce-check-terms.php

<?php
/**
 * Plugin Name: WooCommerce Check Terms & Conditions
 * Plugin URI: https://gist.github.com/BFTrick/7789974
 * Description: Make the Terms & Conditions checkbox checked by default
 * Author: Patrick Rauland
 * Author URI: http://patrickrauland.com/
 * Version: 1.0
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @author		Patrick Rauland
 * @since		1.0
 */

/**
 * Always check the WC Terms & Conditions checkbox
 *
 * @since 1.0
 * 
 * @return bool
 */
function patricks_wc_terms( $terms_is_checked ) {
	return true;
}
add_filter( 'woocommerce_terms_is_checked', 'patricks_wc_terms', 10 );