To pick on a comment probably not meant as serious economics: It is most emphatically not a tragedy of the commons. We don't commonly own FT.com or share in its use. It is privately owned and thus a tragedy for FT's owners, if it significantly impacts their profits. Probably not.
They know. They're referring to the page this thread is about, which lists Tragedy of the Commons as a reason for a 404 with this explanation:
> Everyone wanted to view this page, but no-one was willing to maintain it.