"After I returned to the U.S., I obtained a document showing a detailed account of Tether Holdings’ reserves. It said they include billions of dollars of short-term loans to large Chinese companies—something money-market funds avoid. And that was before one of the country’s largest property developers, China Evergrande Group, started to collapse. I also learned that Tether had lent billions of dollars more to other crypto companies, with Bitcoin as collateral. "