Ancestry.com already offers the option to block certain users from contacting other users. How hard can it be to modify/add to that blocking process, to keep certain users from copying?
I have a public tree, because I believe in sharing and helping. I have made some great friendships with distant cousins who also have public trees.
I object to the members who copy indiscriminately, just because a leaf wiggled. These people have people married to themselves, their children, their grandparents, ad infinitum.
I know we can't control the world and we can't cure stupidity, but why can't we control just our little corner?