Yeah that's a big problem. Pretty sure you can see it in real life where lots of old dead accounts with weak passwords on facebook or twitter eventually get hacked. It must be pretty weird to see your dead grampa suddenly start trying to get people to buy some weird scammy crypto.

I guess you could have an eyeball scanner at your computer that only sends out a binary "yes this person is human" to the system every time the log in. That sounds expensive and hackable and just janky though.

Maybe it would result in people taking Internet security seriously and holding companies accountable for data breaches if there were this sort of consequences for it