Lets look at some recent real-world examples for how you could take advantage of tether.
Lets rewind time and go back to December - January 2017 when we turned $10,000 into $100,000 by purchasing FUN at $0.02 and holding until it reached $0.20 for a 10x gain. This is a great time to realize some of our profits and eliminate the risk of losing those gains if the value of FUN or BTC (or both) drop!
On Binance however, like many exchanges, I can't turn my bitcoin into cold hard cash; I'd have to transfer off of the exchange, get charged a withdrawl fee, wait for my bitcoin to confirm in my Coinbase wallet (or fiat exchange of your choice), and then finally sell my bitcoin for cash.
This is where tether comes into play. On Binance, there are currently 6 trading pairs with USDT. Instead of the above scenario, I can simply trade my FUN for BTC or ETH, and then trade my BTC or ETH for USDT instantly right on the exchange, without having to send my funds anywhere.