Your DNA information that's shown on those profiles is for autosomal DNA. We get half of our autosomal DNA from each parent. As a result, we share approximately half of our DNA with each parent, 1/4 with each grandparent (or an aunt or uncle), 1/8 with each great-grandparent (or first cousin), etc. WikiTree only displays our autosomal DNA information on profiles of people who have a reasonable chance mathematically to share DNA with us.
(For reasons related to how the software calculates relationship distances for this purpose, Wikitree doesn't extend matching information to the profiles of fourth cousins, who may have discernible DNA matches, but your question is about ancestors.)