Micro-plugin to make new WooCommerce coupons default "Individual use only" checkbox ON in the editor

woocommerce-coupons-default-individua-use.php

/**
 * Default coupon editor to enable individual use.
 * Avoid stacked coupon discount abuse / admin mistakes.
 *
 * @see https://gist.github.com/bryceadams/6bb8ff287e1016b933c593d755e25a86
 * @since 2020.04.07
 */
add_action( 'woocommerce_coupon_options', static function( $coupon_id, $coupon ) {
    if ( 'auto-draft' === get_post_status( $coupon_id ) ) {
        $coupon->set_individual_use( true );
    }
}, 10, 2 );