Google’s policy shifted. You can show the crawler full text of an article and then put it behind a paywall for example.
Not only does that benefit the site owners, it benefits Google by creating a moat. Any new entrant to search is initially restricted to the same content as you or I.
Doesn't it make search worse though? I don't like my searches to end at paywalls and Google being able to do more of that doesn't seem an advantage.