You misunderstand me. I'm trying to say that not
every Google Play policy is something malware or spam is interested in violating.
Let me give a hypothetical example: Suppose there are color contrast requirements, to make buttons easy to distinguish. If your app is too desaturated, and buttons are hard to make out, the reviewer can tell you that you must make your app more colorful, and that information won't help malware or spammers one bit.
Or for a non-hypothetical example: How does it help spammers or malware to know that their app mustn't contain "free" in the title?
Or suppose they institute a policy where you're not allowed to re-implement functionality provided by the Google Play store (Google worked hard for that lock-in!), or make apps that are substitutes for ones provided by Android itself, or apps that break DRM.. how would being told you've violated one of these policies, help malware writers and spammers?