To use another situational analogy ......
Lets say a man was once a devoted practicing Mennonite who made business relationships with other fellow Mennonites over the years but he eventually left the religion and was no longer seen by this religious group as a member or brother as it may be, so these people decided not to continue on with any further business engagements with this fellow..
Would the Mennonite religious organization be legally accountable for this eventual occurrence this man had to endure or suffer ?
I think not .