Hi, Peter. I know there have been some G2G discussions the past couple of months that even Chris Whitten weighed in on about modifying the requirement that all parties in a "confirmed with DNA" chain have profiles on WikiTree, but I don't know if there if there have been any subsequent conversations or movement about changing the WikiTree policies/guidelines. I agree that we should somehow figure out a way to enable a form of that--particularly for privacy concerns of living individuals who don't want a profile on WT--but I'm not completely certain how that would work in the yDNA scenario you described.
I'm most familiar with the results space FTDNA creates for the DNA projects housed there, and there is no requirement for a project member to provide any substantiation for the lineage they describe as earliest known paternal ancestor...or even to provide a name for that ancestor. In fact, they can't offer any real detail because that information is entered on their personal FTDNA bio, not under control of the project, and a maximum of only 51 characters is allowed. Also, the name of the kit owner is never displayed on the project page, and neither is a link to the owner's GEDCOM, or whether they've even uploaded a GEDCOM.
Since there is no publicly available genealogical information about members of an FTDNA project (assuming the project admin keeps the project results at FTDNA, which the vast majority do), wouldn't we at least expect the WikiTreer to be able to describe the basics of the anonymous tester's ancestry as well as link to the public results page that shows the kit number? Here I'm thinking inclusion (along with DNA matching specifics) of something along the lines of:
John Doe has been in communication with the owner of FTDNA kit #123456 and has seen the documentation of his ancestry through his great-grandfather, Byron Doe (b. 1894 Lexington, Kentucky; d. 1978 Omaha, Nebraska); through his 2g-grandfather, Charles Doe (b. 1870 Atlanta, Georgia; d. 1948 Omaha, Nebraska)...etc. through to the MRCA paternal ancestor Adam Doe, b. 1700.
Strikes me we'd need something similar so that, while protecting the identity of the anonymous tester and living or recently living ancestors, we'd still have adequate information to be of genealogical use to other WikiTreers. Even if there are no profiles on WT for the anonymous tester's line (it would be nice if John Doe would create those for persons born over a certain number of years ago), at least there would be rudimentary information so that others could tell if their own branches might intersect. I know we could simply say that anyone interested should contact John Doe for information, but as a family tree site first and foremost, that would seem like pushing genealogy to the background...much like the the 80% of our AncestryDNA cousins who have no public tree and who never answer contact requests. ;-)