The payout is the complicit exchanges wash trading Bitcoin, SOL, etc., with freely printed and unbacked tethers, in order to drive the price up. The more crypto goes up, the more people FOMO in and trade, the more money the exchanges make.
I don't see the payout. If you buy $100 of Tether, it will only ever be worth a maximum of $100.
By what you describe, the crypto purchased with Tether would be the Ponzi... but that's not the subject of this article or my question on why people insist Tether is a Ponzi.