> In fact, Google wants even more such results. See First Click Free: http://support.google.com/webmasters/bin/answer.py?hl=en&....

Google wants to index as much content as possible. It's providing incentive to content owners to let Google index it. As pointed out by another commenter, clicking on the search result summary shows that document in full. It's only the subsequent clicks that can be paywalled.

> Oh and here are 240 million login-walled pages: https://www.google.com/search?q=inurl:groups.google.com/grou....

Is it asking to sign in? I tried in incognito mode and I could read the groups just fine.