> This is the view of the InternetArchive <https://archive.org/web/>, but this
is also too simplistic. What about load-balancers, caches and replicas, just
to name a few?

Indeed, now you mention it, the ads I see on a page are the result of some
complex algorithm whose inputs we don't even know, but certainly include the
amount of credit left in the advertiser's account, which is decremented as a
side-effect of the function call...

Michael Kay
Saxonica