Q&A in original version
Question: Could it be that "great filter" is not an extinction event, but an effort of majority of civilisations to hide? Similarly as many species choose mimicry as a strategy to survive. For civilisations can be profitable to not atract attention of other civilisations, to be "invisible". Also AI of other civilisations could be affraid of another civilisations (or their AI) and choose hiding strategy. Could this be the answer to the Fermi paradox?
Milan Čirkovič, Astronomical Observatory of Belgrade & The Future of Humanity Institute, Oxford University: Well, it certainly COULD be - and it is part and parcel of many proposed hypotheses for resolving FP (e.g., the Zoo hypothesis of Ball, or the Planetarium hypothesis of Baxter). At present, we can just classify various hypotheses for resolving FP and assign them some preliminary likelyhoods. Actually, I have, with my friend and coworker Robert J. Bradbury (who, sadly, passed away in 2011) myself proposed a similar hypothesis in 2006, according to which advanced civilizations migrate to the Galactic rim and thus become less visible. However, I maintain that this whole class of hypotheses for resolving FP is rather IMPROBABLE, at least in comparison to the alternative classes of hypotheses, such as catastrophic or the logistic ones. The reasons are rather complex, but the major one is that it is a priori improbable to assume such uniformity of behaviour by species and cultures separated by huge distances not only in space and time, but even more in the space of biological and cognitive morphology. Postulation of such uniformity without any compelling theoretical reason is, to my way of thinking, tantamount to giving in to our anthropocentric prejudices.
Stuart Armstrong, Future of Humanity Institute, Oxford University and Oxford Martin School: This is an unlikely solution to the Fermi paradox. The first reason is that it involves complete convergence of goals among all civilizations: all must be hiding, with not a single one being visible, for this to work. This also requires convergence of goals within a civilization: all subgroups must agree on the strategy (or the civilization must have the means of controlling all its subgroups).
Secondly, it is very easy and cheap for an advanced civilization to expand across the universe. They could do this discreetly, if needed. The best way to protect yourself against invasion is to grab as many resources as you possibly could. No solar system would go "unclaimed". Even if they were being "invisible", they would still discreetly eradicate any intelligent life on systems they had a claim to, to prevent a rival from developing and (more importantly) to prevent that intelligent life from sending out signals that would draw attention.
For these reasons, hiding is not a very likely solution to the Fermi paradox.
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