Not a good way to start the article. I think Tether can crash without affecting MSTR or COIN, for example. A short on GBTC might be more obvious connection. But... that's another article for sure.
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Otherwise, the news on Tether's sketchy drum has been beaten for almost 5 years now, at least by my own memory. Tether could very easily survive this most recent crash by... whatever mysterious means its survived before.
This blogpost adds a $18,000 BTC price as the time they think everything falls apart. An interesting theory. Maybe we'll get there in a few weeks and see if the theory bears any fruit. Its an objective price point for sure, so its an easy one to test if the price shifts lower in the future.