The connections that are reflected on the WikiTree Relationship Finder is determined by the Ancestors and not DNA.
For example, my Relationship Finder connection with William White (from the Mayflower) was determined by the Relatives from myself to my father to my grandmother and so on and not via DNA.
If I had a WikiTree Profile without any family members/ancestors, the Relationship Finder will not connect me with anyone else.
I hope I had explained this okay via text...
Good Luck! :-)