Do we know what token they swapped USDC for? Why would you swap a stable coin for another token? Didn't FTX swap coins for their native currency and use the proceeds for Alameda?
Actually it makes thing easier for user because now USDC and BUSD always calculated as 1:1 with no swap fee. Crypto pair are more lean since they only need to pair with BUSD.
Options to withdraw USDC still available and will use BUSD balance.
They've been extending this promotion for a while now...
https://www.binance.com/en/support/announcement/binance-exte...