>What if you passed away and someone wants to access your old data by getting your old email domain Oo
What exactly do you think happens to anything of yours after you die if you don't prep for it? With many organizations or property your heirs can use a death certificate or court order to get stuff, in other cases they may just be out of luck. You may even wish it to be so, do you actually want them to have access to your old data? All of it or only some? If you actually care then like anything you need to prep for that while you're still alive in any one of the numerous ways available. If you don't then tough shit, that's why there is constant reminders about setting up wills/trusts and keeping relatives/friends/colleagues in the loop as needed and so on and so forth.
