  Without evidence for occupying a special time or location, we should not
assume that we inhabit privileged circumstances in the Universe. As a result,
within the context of all Earth-like planets orbiting Sun-like stars, the
origin of a technological civilization on Earth should be considered a single
outcome of a random process. We show that in such a Copernican framework, which
is inherently optimistic about the prevalence of life in the Universe, the
likelihood of the nearest star system, Alpha Centauri, hosting a
radio-transmitting civilization is $\sim 10^{-8}$. This rules out, \textit{a
priori}, Breakthrough Listen Candidate 1 (BLC1) as a technological radio signal
from the Alpha Centauri system, as such a scenario would violate the Copernican
principle by about eight orders of magnitude. We also show that the Copernican
principle is consistent with the vast majority of Fast Radio Bursts being
natural in origin.
