One person who was descended from the sibling of my GGG grandmother sibling's husband/wife. (Note: not a blood relative at all). I wouldn't have minded if they just took a few details that were needed, but instead they copied the ENTIRE tree. Including things like my parents' wedding date. I don't just mean the descendants of the line either. They went down from my GGG Grandmother, to her daughter, to her daughter, to her son, to his wife, to her mother, to her mother, to her mother, and to her mother, along with all the siblings too and every single detail.
The two reasons I hate it are because:
1. The information is often about living people, and for someone you don't know to have all that information about you, is extremely creepy.
2. Anyone wishing to find a link to my tree might find theirs first, and contact them instead of me. They must get tons of emails.
I now search quite regularly for living family members to see if anyone has stolen my tree.
Andrew