when you "lift" info from another tree, be careful to document it yourself.
I use Ancestry as a kind of "placeholder" when I am working on several trees at once. As I "prove" my tree info, I keep it documented elsewhere.
Thus my stuff here at ancestry is only undocumented or loosely documented for the most part, awaiting further research.
So you will see that my ggggggmother here is my best guess for the moment, and my final results may be pending further research.
I could care less whether someone sees it and uses what I have so far, You are more than welcomed, but "lift it" with a grain of salt.
As for Private trees, I have contacted some and they have always been more than gracious to help me. Every single time.