If the comments were removed due to being presumably being illegal (rather than due to company determining they simply don't want that kind of speech, e.g. spam

If the comments were removed due to being presumably being illegal (rather than due to company determining they simply don't want that kind of speech, e.g. spam) wouldn't it be prudent for the platforms to report all instances to the local police after removing the comment? If the police determines to not continue with the investigation then the speech must be legal and thus could be restored and they can adjust their moderation accordingly.