Smme other member would get reward, but how would anyone know if thy actually deceased if nobody confirmed that information?
In most cases it is the same thing if someone simply stopped using forum account or if he died in any way...same thing could be said for Satoshi Nakamoto in bitcointalk forum.
In most cases it is difficult to confirm information like that, that's why I said that maybe in more closed user groups (local boards with more activity) it could be possible.
We must not forget where we are, Internet, and that here the closeness that technology offers is a very distant closeness, that's why I think it's better to let things happen naturally.
Everyone is constantly posting new posts from their accounts. And of course, everyone's post quality writing style, post description style is different, so when the owner of an account changes, checking the post of that account will clearly understand that the account is not being used by the first owner. Although it is very difficult to find because these things are difficult to find unless a user is tracked regularly.
I don't think there is any problem with the fact that an account can change owner if someone dies and a family member can use it. But since everyone's honesty is not the same, if these things can be found out, it should be mentioned with a natural tag on that account that the account should not be used by the first owner, so if anyone does any new transaction with that account from that time, verify it again and then do it by his own risk