I am still trying to figure out if there is a way for users of ancestry to access the right source site. I do not have a subscription to ancestry.com, and I get my feed from ancestrylibrary.ca. I can't see links shared by others because for me they are behind a paywall, and I suspect others can't see the links I put up, for similar reasons. I thought I read somewhere that there was a way to configure this in WikiTree, but I did not understand the explanation, and now I am no longer sure whether it is in fact possible to do what I want.