Exclude all products within a category from global role-based rules

wcfad_exclude_categories_from_role_based_rules.php

<?php
// Exclude all products within a category from global role-based rules
function wcfad_exclude_categories_from_role_based_rules( $excluded ) {

	// Exclude all products in a category
	$excluded = wc_get_products(
		array(
	    'category' => array( 'fruit', 'vegetables' ),
			'return'	=> 'ids'
		)
	);

	// Include variations
	if( $excluded ) {
		foreach( $excluded as $excluded_id ) {
			if( WC_Product_Factory::get_product_type( $excluded_id ) == 'variable' ) {
				$product = wc_get_product( $excluded_id );
				$children = $product->get_children();
				$excluded = array_merge( $excluded, $children );
			}
		}
	}

	return array_values( $excluded );

}
add_filter( 'wcfad_exclude_from_role_based_rules', 'wcfad_exclude_categories_from_role_based_rules' );