As for "why archive.org and not archive.is" - that's a bit of a borderline call, but gouggoug pointed out some of it at >>37130890 . The set of articles which (a) are no longer on the web, (b) are not on archive.org, but (c) are on archive.is, isn't that big. Paywall workarounds are a different thing, because the original URLs are still on the web (albeit paywalled). For those, we want the original URL at the top level, because it's important for the domain to appear beside the title.