I suggest to have a read to this research, which analyse relations between Theter, BTC price spikes and Bitfinex.
I hope they are wrong because if all of this is true there are going to be bad times ahead.
http://www.tetherreport.com/I'm afraid that the report could be right.
Bitfinex and Tether are not better than any Central Bank in the world and I'm staying away from both. They are printing tethers faster than more banks do.