Exoplanets and Fermi paradox: can we ever get an answer from other civilizations?

SETI, AI, and mirror bacteria.  Can the first alien encounter happen with a creature that we created ourselves?  If we want to find "another Earth".   First, we must determine. What does that other Earth mean this time? The other earth doesn't mean that there are any lifeforms. Or lifeforms are possible in the way we know them.   Does that mean a rocky planet? That is frozen like some giant Pluto? Or does that mean some locked planet? Or a planet where aliens listen to jazz music?  There is one interesting idea about the hypothetical alien civilizations. That could be at our level. They might reach Kardachev-scale 1. And that means they are only a little ahead of us. It's possible. We think that the messages that those civilizations send are coming from our own military forces. In that case, we must realize that the aliens might not want to send messages to other civilizations.  In that case, the data that the hypothetical civilization sends is acciden...