Yes, this is a problem. Early in my genealogy journey, I posted my family tree on geni.com. That turned out to be a big mistake. It was latched onto (hijacked) by other people who added individuals to whom I am very clearly not related. The numbers of wrong additions to my tree has grown and grown. When I contacted to Geni I was informed that, since other people had latched onto my tree, I could not remove the wrong entries. There was also no way I could delete my tree. My only option would have been to cancel my Geni account, which, however, would not have removed my tree.

Stephen Katz