.....at least on Wikipediocracy, so far as we can tell. According to Business Insider and Search Engine Land, Wikipedia has been losing hits all year, and in mid-August Jimmy Wales wrote in his User Talk page that "We know there is a longterm issue with decreasing traffic from Google but this article makes it seem like something new and "sudden" and "massive" has happened." Afterwards, the Wikimedia Foundation issued a pdf file written by Ironholds (Oliver Keyes) himself, which was mostly graph charts.
SimilarWeb which was featured in the Business Insider article; if you click on it you can see it goes from January 15th to June 15th and the views start at two billion and four hundred million, spike on March 15th at two billion and five hundred million, then slip back to two billion and three hundred million from April 15th to May 15th, before slip-sliding through June and July.
What was the cause? Wikipedia finished switching from the regular hypertext transfer protocol (HTTP) over to HTTPS, the secure version of it. Of course, that killed the bots who come to Wikipedia for a huge number of reasons, so the "false clicks" dropped. The other thing are smartphones (there are technical issues doing editing work on Wikipedia through mobile devices.) The last thing is Google's "answer box" which pops up if you ask the search engine questions. Wikipedia was the the fifth-ranked website in the world early last year; now it is tenth. It sits below Yahoo, VKontakte, Live.com, Odnoklassniki.ru, Yandex, and Instagram. And those sit below the "Holy" Trinity of Facebook-Google-Youtube. That must be humiliating.