But that's not what you said. You said $15,000 usdT, which is incorrect.
Admit it and move on because changing topics midstream doesn't fool anyone and just exposes how flimsy your reasoning was to begin with.
I am not changing topics, my point is that when you see a price of $15000 on the exchanges, what you are actually seeing is mostly btc/usdt pairs, that is, you are getting 15k usdt for a bitcoin, not USD. You can see it in e.g. https://coinmarketcap.com/currencies/bitcoin/markets/
It is currently pegged 1:1, so you can exchange it for actual US dollars for the most part, which allows exchanges to claim that USDT=USD and they merge them all into a single thing. But there is no reason to believe USDT is actually equal to USD as they keep printing billions of them without any proof that there's any real money behind it.
Until it isn't. There is zero proof those guys are actually holding their claimed $16,866,411,506 USD in cash somewhere, considering they were kicked out of all the banks years ago