S&P lowers Tether's ability to maintain its peg to the US dollar to the lowest rating.

S&P ratings have been around for over a century, and if I remember correctly, the last time there was extensive coverage of a downgrade by S&P was with Guangzhou Evergrande, when there was a lot of criticism, and later everyone became aware of the two trillion issue. If Tether were to collapse, the amount might not just be a two trillion problem.