A serious question: why are earth-like conditions suggestive of extraterrestrial life and not, say, extraterrestrial McDonalds? The observed frequency is identi

A serious question: why are earth-like conditions suggestive of extraterrestrial life and not, say, extraterrestrial McDonalds? The observed frequency is identical so far. I think the answer must be a bias towards believing in some essential specialness or uniqueness of life, which isn't supported scientifically.