It's actually pretty common for banks to lend out up to 90% of deposits, and keep only 10% in reserve. Hence the term "fractional reserve". However, let's not use the scam that is fiat banking as a bench mark for judging a good coin. Most coins look good when judged against these low standards.
This wasn't common in the united states until 1999 when President Bill Clinton repealed regulation separating commercial banking from investment banking known as glass steagall, which was created in the aftermath of the Great Depression to prevent bankers from gambling on risky investments with the money of depositors.
I would be interested to know why comparisons between crypto and existing financial industries are not valid comparisons in your eyes. At least some of the negative content people read about tether, is published at the direction of banks. Most of the negative things you read or hear about tether likely comes from banks utilizing their influence on the media to push agendas.
What should the standard of comparison be if not tether vs our traditional financial industry?
So cash equivalents, which includes the bitcoin they stole bought with USDT they printed out of thin air, as well as interest on the $850 million loan they paid to themselves. They printed $850 million out of thin air, loaned it to themselves, charge themselves interest on that loan, and then says your assets are backed up by the interest they are paying themselves. That is in no way liquid or stable.
Also worth noting that whatever percentage of their assets are backed up by actual USD, that USD is obviously being held in a bank and so is therefore subject to all the same issues with USD which you outlined above. Tether is compounding problem upon problem.
Tether doesn't hold stablecoins in trust to back their product. What they hold are US dollars and assorted assets. The argument that tether prints money out of thin air to back their platform doesn't make much sense to me, in that regard.
When consumers purchase stablecoins like tether, essentially what they're buying isn't a digital token. Its a solution to a problem they face. For some stablecoins like tether are their optimal solution for purchasing crypto. Necessity being the mother of invention is what gives stablecoins like tether value.
The only real question I see is whether private enterprise should have the freedom and right to create their own solutions to problems utilizing digital assets like tether. Whether markets and consumers should be the one's to decide the value of stablecoins. Or whether some centralized authority which currently consolidates power should have the power to decide whether stablecoins like tether create intrinsic value enough for consumers to utilize them.