Many small organisations may only have one person with an Owner account for the very reason that they don’t _need_ to have multiple people with access to that account as you share out access to repositories to team members that have less privileged accounts.

It is much “goofier” to assume that every organisation using Github has two people that have been granted an “Owner” level account.

Once you pass from single user to "organization", multiple "ownership" is du jour

Maybe there are some out there - but they're stupid, if they are