Here’s what consumers have asked with answers from WikiTree staff and previous consumers.
Wikitree is free, and your pedigree doesn't seem to get changed by other users as often as babies' diapers like it does on FamilySearch.org, the only other free, genealogy site I use regularly.
I've been blocked from posting in their forum, or sending Private Messages. The error messages offer an email address info@wikitree.com, but I've never tried it. The normal avenues for requesting help are their G2G Forum and Private Messages to Leaders and Managers. And this is kind of irrelevant, because no website which encourages you to create a personal profile should ever prevent you from editing or deleting it at your discretion.