In quantum experiments the random outcomes are the same for all experimenters, so it can be repeated and the same probabilities will be observed. When you have someone else sending messages, you can’t rely on them to behave the same for all experimenters. If there are a larger group of Muggers that different scientists could communicate with, than experiments might reveal statistical information about the Mugger class of entity (treating them as experimental subjects), but it’s a stretch.
In quantum experiments the random outcomes are the same for all experimenters, so it can be repeated and the same probabilities will be observed. When you have someone else sending messages, you can’t rely on them to behave the same for all experimenters. If there are a larger group of Muggers that different scientists could communicate with, than experiments might reveal statistical information about the Mugger class of entity (treating them as experimental subjects), but it’s a stretch.