Tether may be the most stable of the currencies, always maintaining their dollar parity value.
So, I don't think he really means the currency itself, but rather the founders, yeah? You're saying they're holding onto a goldmine because all other currencies are volatile af, while Tether stands its ground. ALL done with no backing and simply a promise that they hold a dollar for every Tether issued.
I always thought Tether was a scam. But tbh, all those scam ICOs left a lot of disgruntled investors but they also left a few rich "cryptocapitalists", so I would say technically, you're not wrong.