What Karen said. That autosomal DNA "possibly connected" information is set to propagate eight relationship degrees, or eight birth events. That means up to 6g-grandparents vertically up the tree, and to 3rd cousins out the tree horizontally. With yDNA and mtDNA, since they don't go through crossover and combine from both parents at conception, they aren't limited to the degrees-of-relationship setting and will propagate through the tree as long as the specific paternal and maternal lines are unbroken.
It's also important to keep in mind that WikiTree never sees your actual DNA information, so there is no matching performed. What it does is look at the fact that you've taken a test, as entered on your own profile, and that others have similarly tested. Then it pushes that information through the tree as clues for additional research.