Beside all the possibilities of life forming and developing, one thing to think about as far as beings getting detected via electromagnetic emissions is the means of that emission. We went from spark gap Morse Code to digital spread spectrum in a little over a hundred years. We use DSS to help limit detection, along with encryption. Except for stupid shit like "I Love Lucy", we haven't radiated all that much, especially when one considers that it mostly bounces off the ionosphere, and decays at an inverse square law rate when it does leak through. The means of communication through space are rapidly evolving, and mitigate against detection via remote entities.
If you get to thinking you’re a person of some influence, try ordering somebody else’s dog around.
