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Because everyone is adjusted to thinking cold wallets are the only hardware wallet.

This is a new storage technology. The key is generated only at the instant it is needed for a transaction; the memorizable phrase leads to its momentary generation.

Wallets can be hacked. Hack is this sense means accessing the wallet without knowing the seed. However, when a cold wallet is hacked, the key is exposed; when a Bitfi is hacked, the key is not exposed because only the key leads to its momentary generation.

Hope this clarifies.

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