Terra was no stablecoin and it has been constantly pointed out that it wasn't.
USDC is backed 1 USDC for 1 USD. What you're actually seeing here is that the traditional finance system has lead to a crash in crypto. That's almost refreshing. Usually crypto fucks up by itself (see FTX and Terra for the most recent ones).
Arguably, the FTX debacle is in the same bucket, as it was caused by people having their money on an exchange that essentially functioned like a fractional reserve bank.
I assume you're deriving the 23¢ from the 23% they have banked, but I would like to note that of that 23%, roughly a third (3.3bn of 9.7bn) was with SVB. The rest was with other banks not facing the same issue.
USDC is backed 1 USDC for 1 USD. What you're actually seeing here is that the traditional finance system has lead to a crash in crypto. That's almost refreshing. Usually crypto fucks up by itself (see FTX and Terra for the most recent ones).