In reality this is just listening so it wouldn’t attract any attention even if they did find something.
After years of thinking about this I’ve reached the conclusion that there would be no good reason for aliens to come here. Anything they could possibly want is found in vast abundance in space and is there for the taking except for animal protein. I suppose colonization is another reason to come here and that wouldn’t be good for us.
It always cracks me up when sci fi shows portray malevolent aliens coming to earth to take our water or use us for slaves. The components for water “Hydrogen and Oxygen” are among the most abundant elements in the universe. (Hydrogen is the single most abundant and water is in the top 10) Interstellar aliens can make water and making robotic slaves is a lot more effective than using limited humans.