Permit change of ownership.
Add to current free sharing roles of writer / reader, author. Permit someone to pass on ownership of a list by going to sharing and changing someone else's role to author. Restrict to those already shared with, and only the current author could make such a change.
I close this, as long as this feature is already implemented.
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Adminsashika (Admin, Checkvist) commented
Hello, Me
You can change permissions in a list but only if you're it's author (the "Working on this list" section of the Share dialog). -
Me commented
Ah, should have also explained ... an ownership change would avoid the embedded url (weblinks, bookmarks, widgets) / sharing changes that would disrupt the world at just a copy. And permit the new owner to share as desired without losing the old.