I tried to make a contribution a couple years ago and was absolutely dumbfounded and exasperated beyond belief by the arbitrary, unsubstantiated rejections, bureaucracy, etc... An absolute cesspool of humanity.
Early Wikipedia was great. I was able to help build articles on many subjects which were underrepresented elsewhere. Then slowly bureaucracy crept in, and an ever changing forest of jargon and rules. I edited it for quite a while and feel used. A bot marked one of my edits as vandalism because I altered "brother German" to "brother german"! (One is a brother who is from Germany, and the other is a full brother through both parents.)