It is definitely more than that for some sites and it has to be manually managed. For example this year i've seen archive.is capture paid articles of some finnish newspapers and the layout gives away that it is logged in on an account although the identifying details have been stripped out.

There have been periods of weeks/months when they don't have paid access to those Finnish sites. Tried it just now on a hs.fi paid article from today and it didn't work, but for example paid articles from just a week ago seem to have been captured as a premium user.

It is curious how they have time to do it and I wonder if news sites of other smaller languages get similar treatment.