Tidying up the Internet's low-speed trend, how does keyword shielding work?

Recently, I came across a news item released by the Beijing Internet Propaganda Management Office via Qianlong.com titled "Search Engine Service Providers Successfully Tackle Vulgar Content." In the report about Baidu, it was mentioned:

"A representative of Baidu stated that since the launch of the nationwide special operation to rectify vulgar content on the internet, Baidu has attached great importance to this initiative and actively cooperated. A comprehensive cleanup has been carried out on web pages containing lowbrow content such as glamour photography, exposed points, adult literature, wardrobe malfunctions, and偷拍 (sneaky peeks). Over 39 million pieces of information containing vulgar content have been processed."

Indeed, if you search for the five keywords "glamour photography, exposed points, adult literature, wardrobe malfunctions, sneaky peeks" using all domestic search engines like Baidu, Google, Youdao, and Yahoo, except for "glamour photography," the other four keywords yield no results at all, only accompanied by the message: "The search results may not comply with relevant laws, regulations, and policies, and therefore are not displayed."

This blanket approach adopted by search service providers, although significantly effective in curbing the vulgar trends on the internet, also damages the search experience for some netizens and the interests of advertising sponsors. For example, the term "exposed points" is closely related to another term called "露点仪 (exposure meter)." Although I'm not entirely clear what it does, just looking at the first page of Baidu's search results for "exposure meter" reveals that it's a useful product, with the entire page filled with Baidu promotions. If you try searching on Google or Youdao, not only can "exposed points" not be searched, but "exposure meter" cannot be searched either.

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