I'm amazed that an article about a tracking loophole being closed is posted on HN and the top comment is "is this not anti-competitive". This is not Google subverting advertiser networks for their benefit this is Google fixing a flaw in Incognito mode that has been lazily applied to prevent users from working around article limits.

The browser is an agent of the user, don't expect it to reliably hold information that determines what content they have rights to on your server.