WooCommerce - bulk update all product's attributes

woocommerce_bulk_update_product_attributes.php

<?php
// limit number of products for each run to not overburden the server
$args = array(
    'limit' => 10,
    'offset' => 0,
    'return' => 'ids',
);
$product_ids = wc_get_products( $args );
// loop through products
foreach ( $product_ids as $product_id ) :
    // get product attributes from post meta
    $atts = get_post_meta( $product_id, '_product_attributes', true );
    // loop through product attributes
    foreach ( $atts as $key => $value ) {
        $att_name = $value['name'];
        // set each attribute visibility to 1
        $atts[$att_name]['is_visible'] = 1;
    }
    // update post meta
    update_post_meta( $product_id, '_product_attributes', $atts );
endforeach;
?>