Remove WooCommerce checkout add-ons if any product in cart is in a particular category

remove-wc-coa-some-products-in-cart.php

<?php // only copy if needed

// Remove add-ons if any product in the cart is in the "Gift box" category
function sv_remove_checkout_add_ons_for_giftboxes() {

	if ( function_exists( 'wc_checkout_add_ons' ) ) {
		
		$cat_check = false;
		
		// check each cart item for our category
		foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
			
			$product = $cart_item['data'];
			
			// replace 'gift_box' with your category's slug
			if ( has_term( 'gift_box', 'product_cat', $product->id ) ) {
				$cat_check = true;
				// we only need one "true" to leave
				break;
			}
		}
		
		// if a product in the cart is in our category, remove the add-ons
		if ( $cat_check ) {
			
			// get the add-ons current position so we know where to remove them from
			$position = apply_filters( 'wc_checkout_add_ons_position', get_option( 'wc_checkout_add_ons_position', 'woocommerce_checkout_after_customer_details' ) );
			remove_action( $position, array( wc_checkout_add_ons()->get_frontend_instance(), 'render_add_ons' ), 20 );
		}
	}
}
add_action( 'woocommerce_before_checkout_form', 'sv_remove_checkout_add_ons_for_giftboxes' );