Why do Ambire Wallet accounts appear as EOAs on block explorers (e.g. Etherscan)?

All Ambire wallet accounts are smart contract accounts. However, if you haven't done any transactions with your wallet yet, it will appear as an EOA on block explorers such as Etherscan, Polygonscan etc.

This is because Ambire accounts are counterfactually deployed - which means that the code will only appear after your first transaction from the account (e.g. a token transfer from your account to someone else, or a token swap). Receiving tokens e.g. will not deploy the account. When you do your first transaction, you will see it as a smart contract on the relevant block scanner (e.g. Etherscan if your transaction was on the Ethereum network).

Let's look at an example. This is the first transaction for an Ambire Wallet account:

It's sent by an actual EOA (the Ambire Wallet relayer), and the "To (interacted with)" is the Ambire account (contract). The Ambire account didn't appear as a contract before this transaction because there is no way for Etherscan to know that this address is indeed a smart contract before it gets deployed.