For anyone not in the loop, "The Trouble with Tribbles" is an episode
of Star Trek (1966) AKA The Original Series (TOS).

Gopher is great. I really like it, otherwise I wouldn't be using it.
However, online content and resources have a tendency to disappear.
It's present on all of the Internet, but the effect is felt more
keenly in Gopher simply because there are less resources out there to
begin with. Many of them pop up without fanfare (as you do in Gopher)
and disappear a year later. It's a real shame. Again, this happens on
the WWW, but AFAIK, nothing like Archive.org exists for gopherspace to
somewhat preserve these resources.

List of resources I browsed/used that are no longer around:

-me0w.net Searx portal Tracker-free WWW search on Gopher? Excellent!
Gone? Not cool.

-tx.god.jp Youtube search See above, but change WWW to Youtube.

-gopher.su Gbay Optimistic g-commerce application, but understandably
didn't get much traffic or serious inquiries.

-txtn.ws Text news. It had sports and stuff. Deleted. At least the CNN
portal, as of this writing, is still up (codevoid.de).

-gopher.viste.fr Gophermole Multimedia Gopher search engine. Mateusz
gave a valiant effort, but the database was too big.

There are probably more, but I wanted to give these resources proper
recognition.