This works pretty well for above the line advertising restrictions in some contries where brands cannot mention competitors in their ads.
It encourages advertisers to focus on promoting their own merits instead of misinformation about competitors.
Most politicians end up with nicknames over scandals. For example:
Ad depicting a pig in mud. "Do we want this in government?"
Mentions no one directly. But if it were run at the time David Cameron was running in the UK, it would be blatantly obvious who it was referring to, to the people on the ground.
Not so much to the people/machines making approvals of these ads from other nations.