Well, then how can your coins be stolen without the keys? If the keys were stolen using a cryptographic trick, how was it done at scale? It sounds to me like

Well, then how can your coins be stolen without the keys? If the keys were stolen using a cryptographic trick, how was it done at scale? It sounds to me like at some moment the keys were exfiltrated. So "not your keys, not your coins" stands. If you don't have strict control over the keys you don't have strict control over the coins.