Genuinely curious, as someone who has never used Binance nor USDT:
Why is the "directly" part here significant? If I can USDT (Binance) -> USD (Binance) -> BTC (Binance) -> BTC (Coinbase) -> USD (Coinbase) -> USD (My Bank), then whats the difference other than a few extra steps?
USDT -> kraken[1] -> USD -> your bank
or even
USDT -> bitfinex[2] -> your bank
[1] https://trade.kraken.com/charts/KRAKEN:USDT-USD
[2] yes they do allow fiat withdraws https://support.bitfinex.com/hc/en-us/articles/213919309-Fia...
Well, arbitrage! But suppose BTC it is much higher on Binance. You'd then take USD and transfer them to Coinbase:
USD (Coinbase) -> BTC (Coinbase) -> BTC (Binance) -> USDT (Binance) -> ??
Now you need to take these USDT and turn them into USD, to keep the arb running. But that is precisely what doesn't work.
So: the chain you outline is NOT a way to "directly sell USDT for USD", as links can break down.
For example, something vaguely analogous would be:
[Setting: The Olden Days] GP: "I'm concerned because nobody has ever tried to take USD to the government and directly get silver/gold for it." You: "Why is the "directly" part here significant? If I can USD (My Pocket) -> USD (My Brokerage) -> Gold (My Brokerage) -> Gold (My Pocket), then whats the difference other than a few extra steps?"
The difference is that we never tested to see if the USD is actually backed by real gold.
Kraken, Bitstamp, did so for 3 years+
The only peg that exists is the one whereby you should be able to go to Tether Inc and redeem USDT for USD 1:1. That peg has never ever been demonstrated (publicly).
All the other "pegs" are just cash trading. If I trade USDT/USD on Binance...I don't actually have USD. Even on that pair, my USD profit/loss are denominated in USDT.
For anyone who disagrees with the above - please show me market where I can go sell my USDT directly for USD.