Why? It's worth exactly one dollar. Which they have in an account. That's the point. The price of the other cryptocurrency will come down, and the value of USDT compared to that cryptocurrency will indeed rise, as it should when people want to sell to a market where there's more demand on dollars than the asset.

> They are not "magicking" Dollars, they are magicking a commodity (USDT) pegged to Dollar.

But it's supposed to be pegged to the dollar by a real dollar backing. In the scenario you're describing, it's a floating asset not backed by anything, with a value maintained purely by supply manipulation, and being issued to prop up an asset price. The opposite of what it's supposed to be.

> However to say that it "doesn't make sense" when they print more Tether during market crashes is false.

It still doesn't. I mean, it makes sense from a "lets conjure up some money to prop up the price of BTC" angle, sure, but that's not the same as it making sense for something that's backed by cash on a 1:1 basis. Tether should only be issued when people give dollars to the tether foundation. That's the claim on their front page, and the basis of their peg.