You know there’s a partition between their custody and exchange business right?
Discussion
I know but what has this to do with anything?
You claimed they "likely" run out of bitcoin which isn't true or do you think that all 371k bitcoin are customer's bitcoin? I'm sure their own hot wallets are also included in this number plus according to https://bitcointreasuries.net/ they have another 90k on their balance sheet they easily could sell if necessary. And why would they have suddenly bitcoin again the next 2 following days after the crash.
The hot wallet is a minuscule amount of the total number of 371k.
Coinbase has to constantly source new coins from miners.
Follow the incentives the exchange going down for maintenance always seems to come at a time that’s most beneficial for them.
I don’t believe that they can’t handle or anticipate the capacity.
That said I’m not proclaiming to have special knowledge. This is just my hunch, based on years of observation.