It's directly related to hodling. When you need fiat for daily spending, instead of selling BTC, you take USDT loan against your BTC. Same strategy as super rich people like Elon Mask use - they don't sell their Tesla or whatever stock, they take USD loans against that stock.
But how does it work, as in, they would have to pay that loan eventually.
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You bet on increase of BTC price, if it goes up in USD terms, you spend less BTC on paying back. Or you could get a new loan, to pay back USDT for the old one, without selling BTC.
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