I am involved in a Yahoo group set up for an extremely rare disease. Unfortunately the group's founder died and it is left in a sort of limbo. There are two moderators who have full privilege to manage the group but can never change the ownership. Can't close it. And the problems that would be caused by founding another group are huge (many members are not exactly the most technically able). Lots of erratic members would just be lost. The archive of posts would be lost (or at least disconnected from a new group). And so on. And Yahoo are entirely unwilling to help in any way.
Similarly there seems to be no way of cleaning out the membership of deceased members.
Many years ago the systems at the company I worked for accidentally mail-shotted deceased members only with "The AA Book of Country Churchyards".