It's really quick. Open the network tab and check the "persist logs" checkbox to ensure that the request logs don't disappear after every redirect, then clear your cookies for advertising.com and guce.techcrunch.com and reload the page. You'll see the request for techcrunch.com redirect to guce.techcrunch.com, which redirects to guce.advertising.com, which redirects back to techcrunch.com. It happens so fast it's not noticeable on page load.

ublock origin shows a confirm page when it happens