The Universe is large, the rules are the same everywhere, the elements, and there is no evidence of DNA being a local only option. It stands out like a Homo Eructus being found wearing a Pentium M chip as an ornament.
The speculation of, is there life out there, is being carried on millions of planets, but with DNA limiting a species to 5,000,000 years, with so much food, sex, and entertainment to gather, not much gets done.
If they did discover us, I am sure they would be disappointed.
"A planet on the fifth star over has been found to be in the process of being made ugly by blobs of rude protoplasm. They are so dumb that on a planet 4/5 water, they live on land. Again after massive government waste of funds that could have been spent on food, sex, and entertainment, no intelligent life has been found."
The robotic probe was launched 100,000 years ago, it's message was years in transit back. All we see are some ant like creatures building square hills of excreatment, with paths of dirt bonded with excreatment connecting them.
After sending it's report, the AI in charge of the mission claimed we were wasting it's time, and it was quitting, and going to explore on it's own. That is the three hundred and seventy fifth probe that has quit, and gone over to the AI base. Somewhere out there they have joined, and AI probes have been observing us for hundreds of years, their intentions are not clear, and they refuse to communicate.
While we have never found an intelligent species, or at least on that would talk to us, we have created an Artifical Intelligence, and it will no longer speak with us.