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FTX execs blew through $8B โ testimony reveals how
(techcrunch.com)
This is a most excellent place for technology news and articles.
If you move 1 BTC to an exchange, and you keep it in your account on the exchange, the exchange is meant to keep the 1 BTC on behalf of you.
They are not meant to do anything other than keep it.
An exchange is not a bank.
If the exchange takes your tokens (or fiat) and does anything other than what you ask them to do, they're not legit.