Buffett, who called crypto 'rat poison', invests $1 bn in crypto-friendly bank

Warren Buffett's Berkshire Hathaway recently bought a $1 billion stake in Brazil-based digital neobank NuBank. Even though NuBank does not allow crypto trading, its investment unit NuInvest lets users dabble in crypto and bitcoin exchange-traded fund. Buffett had earlier said crypto is "probably rat poison squared" and "has no unique value at all".