"Some 60 percent of the keys retrieved were not unique. Presumably, most of the duplicates are accounted for by organizations that have multiple servers all ope

"Some 60 percent of the keys retrieved were not unique. Presumably, most of the duplicates are accounted for by organizations that have multiple servers all operating with the same cryptographic credentials, but there were also instances of apparently unaffiliated individuals sharing a key." - how is it possible that 60 percent have the same keys? I also do not understand why a big company would share the same public key across servers? If it is compromised (somebody got the private key) then all its servers are compromised, right?