Spamming gravatar

Function deprecated/wp-user-avatar/includes/class-wp-user-avatar-functions.php wpua_has_gravatar()

        $gravatar = 'https://www.gravatar.com/avatar/' . $hash . '?d=404';


$data = wp_cache_get($hash);

        if (false === $data) {
$response = wp_remote_head($gravatar);
$data = is_wp_error($response) ? 'not200' : $response['response']['code'];
            wp_cache_set($hash, $data, "", MINUTE_IN_SECONDS);
        }

wp_cache_* doesnt carry to the next page so this spams gravatar servers, and MINUTE_IN_SECONDS is too often, what do you think about changing to wp_transient once a day instead?

        //$data = wp_cache_get($hash);
        $data = get_transient($hash);
[..]
        //wp_cache_set($hash, $data, "", MINUTE_IN_SECONDS);
        set_transient($hash, $data, 24 * 60 * MINUTE_IN_SECONDS);