Being a victim of fraud is not "voluntary" in any meaningful way.
Voluntary or not is a red herring. The word this discussion is looking for is authorized.
The transfer was authorized by the account holder. They were defrauded. But when they made the transfer, then intended to do so. (The situation is murkier with credit card transactions, at least in America, because they chose to accept a role in dispute resolution.)
The $625mm drained out of Axie's account wasn't authorized by Sky Mavis. That's a different type of fraud than being ripped off.
But that's a different case than money being "drained" from an account by someone else.
And that shows the difference in how each is protected.
If A has a TV, B steals the TV and sells it to C, who sells it to D...then the TV is still returned to A, and D is out of luck.
It protects again bank failure. If the one's assets are drained from the bank, as long as the bank has not failed, it will have to make the account holder whole.
That's why a company would be stupid to hold $200M at Podunk Bank of Littletown, KS but is perfectly fine to hold it in a DDA account at Bank of America, Citi or Chase
But even then, if you store $650 MM in a Bank of America account, that money is protected against being stolen by BOA's anti-fraud software, laws, the trillions of dollars of assets BOA has.
For one thing, most business accounts do not hold 9 figures in cash.
Inflows and outflows are likely to be predictable, so you can set flags for certain thresholds.
A 9 figure transaction would absolutely be noticed, and possibly flagged before it was permitted to continue.
Since 16 year olds can hack into auth providers like okta and then hack into microsoft and steal source code, and this crypto stealing endless happens, there's just not good electronic security. But what is good is I can go to my bank in person and fix things. It would be so much harder for someone to get fake id. I actually have a personal relationship with my advisor at my 401k. Those things do give me some additional security, at least I think so.