I've noticed that user @svadali has disappeared from the all reputation page. He had about 6000 reputation, but was inactive for quite a long time. It is possible to find references if you search for svadali in stackexchange.com, where his id is now substituted with user28 (28 was his user id). I would like to know what happened. Did he specifically ask to be removed, or this was some automatic clean-up procedure?