add_filter( 'wc_anti_fraud_rules', 'wc_remove_antifraud_rules');

/**
* Remove unwanted anti-fraud rules
*
* @return array
*/
function wc_remove_antifraud_rules( $rules ) {

	foreach ( $rules as $key => $rule ) {
		if ( 'billing_matches_shipping' === $rule->get_id() ) {
			switch( $key ) {
				case 0:
					unset( $rule );
					break;
				default:
					break;
			)
		}

	}

	return $rules;

}

    //unset( $rules['0'] ); // WC_AF_Rule_Country
    //unset( $rules['1'] ); // WC_AF_Rule_Billing_Matches_Shipping
    //unset( $rules['2'] ); // WC_AF_Rule_Temporary_Email
    //unset( $rules['3'] ); // WC_AF_Rule_Free_Email
    //unset( $rules['4'] ); // WC_AF_Rule_International_Order
    //unset( $rules['5'] ); // WC_AF_Rule_High_Value
    //unset( $rules['6'] ); // WC_AF_Rule_Detect_Proxy
    //unset( $rules['7'] ); // WC_AF_Rule_Ip_Location
    //unset( $rules['8'] ); // WC_AF_Rule_First_Order
    //unset( $rules['9'] ); // WC_AF_Rule_Ip_Multiple_Order_Details
    //unset( $rules['10'] ); // WC_AF_Rule_Velocities