Sources: due to an accounting bug, Binance erroneously disbursed ~4.8M of Helium's HNT tokens, worth ~$19M, to some of its users, many of whom quickly sold them (Danny Nelson/CoinDesk)

Danny Nelson / CoinDesk:
Sources: due to an accounting bug, Binance erroneously disbursed ~4.8M of Helium's HNT tokens, worth ~$19M, to some of its users, many of whom quickly sold them  —  The Helium network has two tokens, HNT and MOBILE.  Binance counted them as one, HNT, resulting in a windfall for customers who deposited the MOBILE.