I wonder if it's occured to these sites that essentially they're poking the bear. Sure, Chrome can slowly patch these issues, but there's always a possibility that Google just turns around and says "Hey guys! I search engine crawler looks like incognito chrome! Fuck you!"

Alternatively, instead of fixing these issues by making the incognito mode detection break, they should fix them by making regular mode look like incognito mode. Suddenly, all readers are blocked from reading NYTimes for half a day while they scramble to remove it from their site. Then they can start teaching sites that relying on hacks isn't a viable, sustainable strategy.