usdt is not an investment vehicle. you don't "invest" in usdt. it's impossible for usdt to collapse unless the exchanges (or usd itself) collapses in which usdt is no more riskier than any other coins.
even if the so called scandal is true, and there isn't actually a single dollar in the bank, the value of usdt to usd will remain unaffected.
You are wrong on that. USDT is nothing more than a shitcoin in reality. Its value should at all times remain equal to that of the USD, but the initial goal has turned out to be a worthless promise of Tether itself.
The value of USDT has climbed above and taken a dive below $1 numerous times already. USDT is tradable against USD as well, which makes it an investment as well, but one that doesn't yield much.
Tether is a pest that should be exterminated as soon as possible, and the fact that they are directly linked with Bitfinex should raise even more suspicion. People will realize what can go wrong when it actually goes wrong.