There's one thing I don't understand though: if Tether is off-the-charts risky & illiquid if/when push comes to shove, you'd expect there to be a divergence in the price between BTC priced in Tether (on exchanges like Bitfinex, where you're screwed if Tether implodes) and BTC prices in USD (on comparatively reputable exchanges like Coinbase). Yet there isn't: http://www.untether.space/
Are arbitrageurs picking up pennies in front of the steam roller? Or is there something else happening here?