Can off the shelf AI Vision systems detect and censor art nude photographs? - DIY Photography

Question: can AI vision systems from Microsoft and Google, which are available for free to anybody, identify NSFW (not safe for work, nudity) images? Can this identification be used to automatically censor images by blacking out or blurring NSFW areas of the image? Method: I spent a few hours creating in some rough code in Microsoft office to find files on my computer and send them to Google Vision and Microsoft Vision so they could be analysed. I spent a few hours over the weekend just knocking some very rough code. Yes, they did reasonably well at (a) identifying images that could need censoring and (b) identifying where on the image things should be blocked out. Follow on question: Why aren't sites like Facebook and Instagram automatically deploying this technology to identify images and allowing users to choose whether they wish to see such images? How do we know how much of our internet is already censored invisibly?