Tether Crypto just put $1.5 billion on human biology. The USDT issuer has taken a strategic stake in Eight Sleep, the AI-powered sleep technology company, at a $1.5 billion post-money valuation. This is not a passive financial play. It confirms what has been building for months: Tether is no longer just a stablecoin issuer. It is one of the most aggressive venture capital forces in tech. The fuel behind the move is straightforward. Tether generated over $13 billion in profit in 2024, mostly from yield on ...