We discus in this artical how remove woccommerce add-to-cart button in good way, you can find lots of tutorial in this topic but we cover simple ans secure way to the complete this task.
Code here:
remove_action( 'woocommerce_after_shop_loop_item', 'woocommerce_template_loop_add_to_cart' );
remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_add_to_cart', 30 );