Crash course: Vietnam's crypto boom goes bust

As a first-year computer science student in Hanoi, Hoang Le started trading crypto from his university dorm room, egged on by his gamer friends who were making a killing.

At one point his digital holdings swelled to $200,000 — around 50 times the average annual income in Vietnam.

But they crashed to zero when the bottom fell out of bitcoin and other cryptocurrencies in recent months.