Summary for newbs: Bitfinex is a crypto exchange kinda based in Hong Kong and kind of based in Taiwan (this seems to change depending on convenience.) Taiwan recently started becoming more rigorous about monitoring international USD wires, and lots of Bitfinex users had their money stranded in Taiwan. Bitfinex stopped supporting US customers because of these difficulties (AFAIK most customers did eventually get their…
You're skipping a key bit here; billions of Tethers magically appeared on the market in the last month and were used to buy BTC in suspiciously regular fashion, in 100 million USDT amounts, and with no clear evidence that it was actually purchased by anyone using real USD.
1. Tether will not convert your USDT into USD. You can only offload it to a bigger fool.
2. Tether's accounts have yet to be audited.
3. Tether has lied about #1 and #2.