>>deatha+J06
There isn't one. As far as I know, no one really knows for sure how they bypass all these paywalls. (Most credible theory I heard: They actually just pay for the subscriptions.)
>>mr_mit+Zk6
Most paywalls just allow search engines to read their content just fine. Because they do want discoverability, they want their cake and eat it.
There's a few publications that don't even do that though and archive.is is very good at bypassing them so I do imagine they use logins for those, but for the masses of sites it's not currently necessary.
>>direwo+u27
Google isn't the only search engine in the world of course. It probably is pretty much the only one that matters in America but the world is not just America either.