Sorry - yes, I'm the developer of RootsFinder. I'm also the developer of WeRelate.org and GenGophers.com. I served as the CTO of FamilySearch from roughly 2002-2004 and yes I'm a Mormon.
RootsFinder has a partnership with FamilySearch so users can copy data back and forth between their RootsFinder trees and the FamilySearch Family Tree if they want. Users choose what data they want to copy. I'd be interested in ideas for similarly copying data back and forth to WikiTree.
In addition, people who create a tree on RootsFinder can elect to have a copy of their tree stored in FamilySearch Genealogies, where it is publicly visible but not publicly editable. This enables them to receive free hints to FamilySearch records (like Ancestry hints but to FamilySearch, not Ancestry). RootsFinder also has hinting partnerships with FindMyPast, AmericanAncestors, NewspaperArchive, RootsPoint, WeRelate, and WikiTree, so users can elect to receive hints for those sites as well, though some of these sites require paid subscriptions to see the hint results.