Felix Salmon tries to unravel the mysteries:
This paywall is anything but simple, with dozens of different variables for consumers to try to understand. Start with the price: the website is free, so long as you read fewer than 20 items per month, and so are the apps, so long as you confine yourself to the “Top News” section. You can also read articles for free by going in through a side door. Following links from Twitter or Facebook or Reuters.com should never be a problem, unless and until you try to navigate away from the item that was linked to.
Beyond that, $15 per four-week period gives you access to the website and also its smartphone app, while $20 gives you access to the website also its iPad app. But if you want to read the NYT on both your smartphone and your iPad, you’ll need to buy both digital subscriptions separately, and pay an eye-popping $35 every four weeks. That’s $455 a year.
The message being sent here is weird: that access to the website is worth nothing. Mathematically, if A+B=$15, A+C=$20, and A+B+C=$35, then A=$0.