as for that rating, it should be a z. if bitfinex goes and takes tether with it it will cast a huge shadow over crypto this year but it'll ultimately be one of the best pieces of news possible. bitfinex is the last cowboy standing from the wild west days. it has to clean up its act or die for everything to move on and upwards.
Its also very clear that their auditor, Friedman LLP, are washing their hands off Bitfinex and their Tether scheme. Its a good move if they want to avoid any legal problems coming in Bitfinex's way.
Any USDT holder should let go of them immediately or hold the risk of holding worthless tokens when the exchanges start delisting it.
Tether Confirms Its Relationship With Auditor Has 'Dissolved'