Because I have been researching immigrants from an entire Italian town as a hobby for 15 years, and want to share my work and find other immigrant families from the same town. Mundia has a world wide audience, and I want to share our history. But they REALLY do take your private trees as well. Really!!! I have had other friends confirm they can find my private trees on Mundia today. Oh, and I quit yesterday, but any info I added to my Ancestry trees today shows up on the Mundia tree. Did it to test and I saw one friend confirm this for me with my own eyes. So even tho I hit the "hide my trees"button and "I want to quit" button on Mundia, they are still making all my trees viewable. And they ignore your emails. Wow, how can you resist joining a great site like this. Yeah.