The Eschatian Hypothesis: Detection Biases and the Expectation of Extreme Technosignatures

To the point

Because how we search and how often we look biases what we notice, the first detectable signs of extraterrestrial intelligence are likely to be extreme, conspicuous signals such as waste heat or radio leakage rather than typical, subtle indicators.

First contact with an extraterrestrial civilization will not be subtle, according to a recent study
earth.com

First contact with an extraterrestrial civilization will not be subtle, according to a recent study

Scientists claim that first extraterrestrial contact will be a loud event impossible to ignore, not a subtle signal.