The series “Beyond Survival” details the existence and unlikely continuation of such cultures. While I want to sympathize with the narrator’s laments that such cultures will soon be lost for various reasons, I just kept returning to the observation “well, yeah...” Prime example being one ocean-oriented culture that barely hangs on by fishing...with bare hooks.
One of the cruelest things I read is when liberals want to ‘protect’ these cultures by keeping them isolated from modern society; not having a choice if they want to not starve or die before they are 30 from a parasite. They are treated almost like zoo animals to liberals instead of humans.