keep the keys in different locations is more ways of losing it.
You can learn more here : https://zengo.com/how-zengo-guarantees-access-to-customers-funds/
The keys are stored and encrypted and never share to zengo or you, that's the magic and high security level of MPC.
In case of Zengo is out of business or the servers are down, they activate a emergency recovery mode with trustee, it needs to be confirm by humans, and the keys are send to the customer for withdrawing in any other wallet.
Ok, you can believe whatever you want. Sometimes people believe in bad ideas.
You can store encrypted keys from a COLDCARD yourself. You can also get a 2-of-2 multisig with a timeout through something like Blockstream Green. Or you can do a 2-of-3 with 1 counterparty through Casa or Unchained. There are a lot of options, and they all use standard formats (like BIP-39) and best security practices.
Google Cloud & face scans are not the way to do Bitcoin. Certainly not the safest.
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