Microsoft has acknowledged this is in error...[1] (though the error seems to be that censorship meant to just apply to China is being applied everywhere)
[0] https://news.ycombinator.com/item?id=27395635
[1] https://www.vice.com/en/article/qj8v9m/bing-censors-tank-man
Maybe they can somehow detect censorship real-time and have their own hot image cache for a certain sized corpus.
This is a fun problem for them to solve for us now that it's a failure mode they didn't fully appreciate until now. They are a search engine aggregator, they need another feed for internet images. This is an engineering problem to do cheaply centrally or distributed.