Hello Interloper!
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Perhaps the reason is simply that the lucrative gains from getting consumers through the door outweigh the small risk of being caught and told to cease your advertising strategy by the ASA and MHRA. In other words, no one with snarling teeth is there to really deter the practice so it persists. The more people get away with it, the more the good guys get annoyed and wonder whether they should ‘move to the dark side’ as well!