Hides checkout fields based on the products in the cart

functions.php

/**
 * Hides checkout fields based on the products in the cart
 *
 * @param  array $fields
 * @return array
 */
function conditional_checkout_fields_products( $fields ) {
    $cart = WC()->cart->get_cart();

    foreach ( $cart as $item_key => $values ) {
        $product = $values['data'];

        if ( $product->id == 70 ) {
            unset( $fields['billing']['billing_company'] );
            unset( $fields['shipping']['shipping_company'] );
        }
    }

    return $fields;
}
add_filter( 'woocommerce_checkout_fields', 'conditional_checkout_fields_products' );