or with regard to security, if their databases are leaked, it will not be very difficult for hackers who have on hand such devices which are used to calculate and force passwords to obtain private keys because to at a certain point, the keys and the account are encrypted using your password.
Well not only that, but so many users use the same small handful of passwords (or sometimes even just a single password!) across all their accounts. Given the number leaked accounts, passwords, and other credentials (
https://haveibeenpwned.com alone has over 11
billion), then attackers can just start matching up blockchain.com accounts with leaked accounts belonging to the same person and start trying their passwords.
Do blockchain.com not offer cloud back up as well? (Another huge security flaw in their system.) This offers yet another potential method for wallets to be stolen, especially if your email/cloud storage account has been leaked as above.