FTX stole the bitcoins and other crypto assets from the customers who deposited them. Transferred them to Alameda who acted as MM who sold them to the FTX customers, but everything was fake
Customers buy bitcoins and other crypto assets, then if they don't withdraw in time, they are transferred to Alameda who acted as MM to sell them to the FTX customers
When the balance sheet was leaked to Coindesk, that's when everyone tried to withdraw all their cryptos and FTX quickly ran out
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When FTX customers wired fiat, the funds went straight to Alameda account. I have a separate thread that Silvergate bank may be in a lot of trouble as they were in the middle of that mess. Same FTX MO, customer deposits of fiat were stolen immediately after deposits and transferred straight to Alameda account
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When FTX raised funds through venture rounds, the money was borrowed by Sam in the billions. Check the bankruptcy papers
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So to summary, FTX stole customer deposits of crypto assets and FTX stole customer deposits of fiat, and then FTX stole the funds they received from their private investors by loaning to their top management
FTX and Alameda and SBF stole $10-50 Billions worth of stuff, by some estimates
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But it's all the fault of cryptos. The regulators will come down hard on cryptos