It also assumes that it is nearby aliens. Our radio transmissions have only gone 100 light years, and probably not detectable beyond a few. But the aliens could

It also assumes that it is nearby aliens. Our radio transmissions have only gone 100 light years, and probably not detectable beyond a few. But the aliens could be saying hello to everyone from thousand light years away. It also could not be a message. I think we have ruled out nearby Dyson Swarm (as in thousands of light years), but we could find one in rest of our galaxy or even Andromeda. Dyson Swarms should be noticeably weird infrared stars. It is also quite possible that we never decode their message. Even with one designed to be decoded, their thinking could be too different.