I’d be a gazillionaire if all the connections Ancestry.com made from me to famous people on my mother’s side of the family were all true. Unfortunately DNA doesn’t go back farther than five or six generations, so those connections are anybody’s guess.
That is not always true. It can persist longer at times. X chromosome for one instance. I also have many cousins who are 5, 6th, 7th cousins etc, that I know of through DNA, probably because our ancestors married cousins repeatedly.