Earlier quoted context omitted.
$2,000,000,000+ worth issued without proof of backing? What value did Tether add that people were willing to deal with it as a middleman to dollars? Side note: The graph could use some TLC. The colors are indistinguishable and there are no static historical charts on the page, just the graph since my visit.
A major use of USDT is that you can sell your cryptos when they're high, converting them to USDT, which holds it's value. Then, when the crypto prices drop, you buy in again, and repeat. By keeping it entirely in the crypto space, your country's tax system can't charge you for capital gains.
This is blatant, willful and permanently-documented tax evasion, an amusing combination of illegality and stupidity.