Big pipe is new since drupal 8 and introduces a way to load and render blocks which have a high cache invalidation, or are uncacheable, during the stream of the response.
With this plugin, you can use the legalweb.io cloud service with your Drupal page. It connects to the legalweb.io web API and fetches your legal texts, terms & conditions and integrations to insert it in your Drupal Page.