USDT's price is consistently adjusted to be equal to 1 dollar. Users at poloniex.com use this instead of dollars.
How do they make the USDT equal to 1 dollar I wonder?
Are they also used in other places than poloniex.com? Are there other platforms we can trade USDT?
They do it through centralisation and that's basically what every money transmitting company does.
They claim to have full reserves, but obviously you have no idea even if they publish their figures because there is no third party audits that I am aware of conducted upon their reserves.
And there is always a risk of them refusing withdrawals as they are a centralised company. If that happens then your tokens are worthless.