Personally I don't think these tether conspiracy theories were ever true. Maybe they aren't 1:1 backed, but they have always been financially well off enough to keep the company running. And after the interest rates went up, they are probably making a killing. Typical bank has minimal reserves compared to them, and everyone is fine with that.
That’s completely untrue, and Tether isn’t a bank.
In contrast, Tether has historically admitted to having as little as $100.20 in assets per $100 in liabilities [0], with a significant fraction of it in crypto and other assets that effectively wouldn't even count toward banks' capital requirements. It has probably dropped below $100 in assets per $100 in liabilities - i.e., been insolvent - at some point, and even taking its latest audit [1] at face value, it has far less capital than would be needed for a bank with the same asset profile in the US or other developed countries.
[0] https://assets.ctfassets.net/vyse88cgwfbl/1np5dpcwuHrWJ4AgUg...
[1] https://assets.ctfassets.net/vyse88cgwfbl/6h4YWqZOXbwtBaPtYg...