I think the question asked on SE "On which country are the creators and servers of archive.today / archive.is based?" incurs not a 'who is he', but 'should I trust them based on their national allegiance'. A similar idea could be presented of large Twitter misinformation accounts that have influenced the 2016-2020 (and future) elections - they're not open about their identity, but the actions they're doing most people would disagree with, so most would decide that it is morally justifiable to go digging for clues to find the source of the misinformation.
For archive.is, it's lower-stakes, but you might not be able to trust the site as an authoritative source in $x years should (for example) their home government take it over and strategically modify archives for their own purposes.