Because it takes a LOT of resources to communicate with voyager to begin with AND you have to know where to look and space is incredibly big. Communication with Voyager (and other probes) relies on the NASA Deep Space Network, three facilities located around the world with massive satellite dishes necessary to send and receive the signals over such a vast distance.
You’d either have to build a sufficiently powerful array of your own OR hijack one of the existing ones. Then you’d have to know where to look which is probably not something NASA advertises.
Short version? The reason no one has done it is a combination of two things:
1. It’s incredibly hard to do
2. There’s little benefit to doing it
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