This is sad but whoever stores their crypto backups / seeds / passwords to wallets etc in an ONLINE password manage totally misunderstood tthe self-custody aspect of crypto / Bitcoin.
I still believe password managers do have some value - for throwaway logins or stuff that is just very convenient to access via some basic account. Anythign related to your identity or any real value does not belong there however.
Also, I do believe there are hardware solutions - didn't Trezor have a built-in password manager? Not sure if they continued this service, though
I believe that not all of these people had their seeds in LastPass. Some of them might have their exchange and email logins and passwords. This allowed the attackers to access their exchange accounts and withdraw money.
Currently people are holding cryptocurrencies on lending and staking platforms as well and it's enough to have access to email account to reset password on these sites and withdraw funds, since the confirmation often comes to that same email.
Also, don't underestimate people. They still fall victim to emails sent by Nigerian princes and send money to new investment platforms promoted by Elon Musk and Jeff Bezos
