I do not believe there is any purposeful or malicious intent from Microsoft. But that doesn't mean they cannot or should not be held responsible for the data that they host and serve.
Wave after wave of recent subreddit bannings due to reddit now believing they will be directly responsible for data they are helping to serve should make one stop to reflect about how exactly such a law would be enforced.
Fine, but responsible in what way? Not like they did it on purpose. Their bots found the images, Bing just forgot to exclude them. Now they're work a lot more to exclude them.