And thanks, Henry, for calling attention to the Ysearch/Mitosearch issue on that particular page that Rob so well crafted. Yep, both those sites went permanently dark on May 24, completely out of the control or influence of WikiTree. Thanks, Rob, for offering to go back and revise that page of instructions. There is also an effort underway, post-GDPR, in the WikiTree DNA Project to revise the help pages...and that will mean finding and removing all references to Ysearch and Mitosearch, among many other things.
On a somewhat related note and for general information only, there are a number of links here on G2G, in profiles, and in Freespace research pages to yDNA surname projects that were hosted at WorldFamilies.net. It, too, decided it couldn't comply with the GDPR and shut down the evening of May 24. Over 700 surname DNA projects were hosted there; some have been adopted by experienced DNA project managers and are now active at FTDNA. The WorldFamilies.net domain name still exists, but following any of the previous links to surname projects there will result in a "Page Not Found" error. If that happens, my best advice would be to go to the FTDNA projects portal page, https://www.familytreedna.com/projects.aspx, and see if the surname DNA project you were looking for has an active page there.