In theory, Wikitree is a grand idea. People voluntarily add new ancestors to the one world tree and enhance existing profiles.
In practice this leads to a tree which, despite some excellent well-researched entries, is cluttered with an immensity of unsourced rubbish put up by contributors with minimal genealogical skills.
While those who just want to input a few generations of their immediate ancestors may not worry about the overall low standard, those who have done any serious research will face the insurmountable hurdle of The Management. If you depart from whatever is the current Party Line in any area, you are hassled or summarily expelled. Of course there must be rules, but what members do not know until they infringe them are the arbitrary unwritten rules (shared by The Management in secret discussion groups).
From personal experience, having once been a major contributor, and from published testimony of other respected ex-members I can assure you that these statements are not personal pique or paranoia and, if challenged, can produce evidence.