[lessname]

That's not just a thing done by blogs. Several "news" sites like (german) t3n.de do this. Or some sites like cnet.com etc... mostly content like "The best CMS as of {insert year here}" - so mostly things you can use years later. However, it doesn't help if the library isn't receiving any updates anymore. I don't think it's just to get a better search ranking but also to manipulate users (they want to use up-to-date software/etc)

[flagpack]

I‘ve been working for an online news network in Germany for several years. They hire people (mostly students) to do nothing but update their old articles on at least a weekly basis. Even too a point where it becomes almost unreadable because of so many useless and non-contextual updates. But it works in terms of ad revenue from google traffic.