That's fine for financial accounts, but people have hundreds of accounts, and you don't know which ones are the ones that matter beforehand. Is it your family

That's fine for financial accounts, but people have hundreds of accounts, and you don't know which ones are the ones that matter beforehand. Is it your family member's AO3 stories that you want? Or maybe the login to the web forum that was their primary social outlet in old age? This assumes that those non-financial sites even have a process to let you in.