“When it arrived, everyone was happy,” said Tsainama Marubo, 73, sitting on the dirt floor of her village’s maloca, a 50-foot-tall hut where the Marubo sleep, cook and eat together. The internet brought clear benefits, like video chats with faraway loved ones and calls for help in emergencies. “But now, things have gotten worse,” she said.

She was kneading jenipapo berries to make a black body paint and wearing ropes of jewelry made from snail shells. Lately, the youth had become less interested in making such dyes and jewelry, she said. “Young people have gotten lazy because of the internet,” she said. “They’re learning the ways of the white people.” . .