Comment by liveoneggs

Eventually someone is 'root'

Up until recently (and my intervention) my work had multiple aws accounts tied to individual people, where they had inherited a personal account into the billing org.

There are also, in business use, some domains where an executive personally owns the registration but has delegated DNS into the company. There is no written agreement.

A former employer completely lost access to a couple of social media accounts (twitter/$company, etc) after laying off enough people.