There are "public collections" (e.g. census) on MH which can be used without a data subscription. For the other MH info:
SmartCopy will use whatever information on MH which you can view with the MH account that "matches" your Geni profile name.
I'm not sure how one establishes that "link" between the Geni username and the MH user name ... I think it may use the email address. That is, if you set up your MH account with a different email than you use for Geni, you won't be able to see your MH "private" profiles.