Interesting video of an uncontacted tribe in Brazil. Videos like this are invaluable for many reasons, not least of which is that it can be used as concrete proof that such tribes exist. When creating policy that affects management of the Amazon, a picture can speak more than 1000 policy memos.
This also allow researchers to gather information without worrying about spreading disease, or leading the wrong people to native peoples’ doorstep.
"Uncontacted" is a fuzzy concept that assumes a bit about the people in question, but in a volatile political situation can also be a safe guard for a vulnerable people.