please don't violate rules of upstream sites

What does it mean for a website to be free software? I cannot make a
change to the code for bugzilla.gcc.org and start running it on the site.
I can download a tarball of the Bugzilla source code, but the
bugzilla.gcc.org site remains unmodifiable by me; it is no more free
software than Linux running on a TiVo.

The only people who have the freedom to change bugzilla.gcc.org for their
own requirements are the site's maintainers. And indeed the maintainers of
the Launchpad site have freedom to change their own code, run modified
versions, and even share it with others if they choose to. They currently
choose not to share it, but nothing in RMS's philosophy forces you to
distribute your code to others - just that if you do distribute it, the
others must have the same rights you do. If I made my own private version
of Apache with a few changes, and ran it only on my own website without
giving a copy to anybody else, would the FSF policy forbid linking to that?
What about linking to a website that uses a couple of CGI scripts? Must
those scripts be published somewhere first?

If the policy is only to link to websites implemented using free software
which is also available for public download, that is consistent, but
extremely strict even by FSF standards. Surely even the FSF's own site
uses some scripts and configuration files they have not made public.
Presumably it would rule out linking to a Bugzilla page that happens to be
hosted on AIX or on Linux running inside a non-free virtual machine like an
IBM mainframe.