What makes it arbitrary is that "a public safety exemption" isn't specified or codified in the language of the anticipated regulation.
Even it if were, there's also another practical wrinkle with using the concept of "public safety" when it comes to "news". Would the definition, for example, include "fake news"?
A company can also decide that it is too risky to automatically detect whether a news article complies with the law (e.g. IF public_safety THEN allow_share) and so it is more practical to just have a simple exclusion for sharing news.
