The story has been picked up by Reuters as well [1]. From a quick look at DuckDuckGo and Ecosia, it seems their image results are similarly restricted because of their reliance on Bing. I am getting results, but they're entirely unrelated to the Tiananmen Square massacre.
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[ 2.6 ms ] story [ 14.7 ms ] thread[1]: https://www.reuters.com/technology/microsoft-bing-raises-con...