While I'm inventing conspiracy theory origins for recent technologies, here's another one:
Bitcoin was invented by an unknown person pseudonamed "Satoshi Nakamoto". Before people used their spare computing time to mine bitcoins, one of the big things they did with spare compute was to run the SETI@Home client, helping to search for extraterrestrials. Who might have a vested interest in redirecting resources away from the search for extraterrestrials? Is "Satoshi Nakamoto" really a /person/?