Initially I thought that as well: "why would intelligent life spew tons of energy into random solid angles?". But there may be a reason to do this. I wouldn't b

Initially I thought that as well: "why would intelligent life spew tons of energy into random solid angles?". But there may be a reason to do this. I wouldn't be sure if they would go through the effort to not pollute -- just look at humans. We pollute space with our signals. Civilizations that command astronomical amounts of energy as if they were pennies might just do the same thing.