What happens then if someone has a private tree but also a public tree?
I have more than one tree and 2 are private the rest are public?
Also, what happens for the people who help on the message boards?
They need to be able to see peoples trees to assist in lookups.
There are thousands of 'queries' each day on the message boards asking for help and if the 'helpers' were forced to have public trees then I think they'd just stop helping.