Man of the Hole
en.wikipedia.org
en.wikipedia.org
Imagine waking up someday realizing that you're all that's left of "your nation". And then going on for decades alone. Now that's a frightening thought.
Presumably there's a way of providing medical treatment and vaccinations such that they could make contact with the outside world. Just having access to information about sanitation practice, germ theory of disease, radio communication, and so on would mean enormous enrichment. If they choose to remain isolated having communications with the rest of the world over the internet would give them economic means of protecting their lands by altering authorities and the world about trespasses.
We collectively isolate them because their cultures are presumed to be of such importance that enforcing primitive and often brutally savage conditions is somehow acceptable in return.
Most African preserves offer better medical care to wild animals than these actual humans have - the imposed isolation seems barbaric, too me.