The only thing you may expect to download from Kardashov 3 is some kind of AI. Do you really want it?
Way i see it, is that it implies you can manipulate gravity, if you can move stars. Or at least, herd black holes to use as gravity tractors.
Would also be interesting to see if they are using optics for communication. If no visible optics, i would guess that they have solved the entanglement issues, and using that for comm.
Would also imply that it IS a machine intelligence or culture, as the radiation hazards in there would preclude most ongoing biolife, other than possibly zoos. That would definitely inform the SETI and METI discussions, and may answer ...
If it's worth saying, but not worth its own post, then it goes here.
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