Rather an invasion of privacy, isn't it?

search for new phenomena like black holes eating each other and so-called dark galaxies without stars

I mean, truthfully - what two consenting black holes do with each other is their business, isn't it? And why should a galxy be "dark" just because it's members decide that no one should hog the limelight as a "star"?

What business is it of ours? And to tap into private conversations between aliens? I mean really!

Does SETI have a warrant for this?