Fun fact: archive.is can even bypass a lot of hard paywalls and no one knows for sure how they do it. There's been at least on debate on HN with no clear conclusion: https://news.ycombinator.com/item?id=36060891

They probably use a combination of residential proxies, actually paying for a lot of subscriptions (including lots of small regional publications apparently) and cleverly removing the "My Account" link, referrer shenannigans, and who knows what else.