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open source debunks the classified notion, by the very essence of open source.. and debunks the back-door notion of the early versions of bitcoin
Just because something is open-source, it doesn't mean the code is clean and written with good intentions. Open-source code can be vulnerable and backdoored, with the developers hoping o one will ever notice it. One does not exclude the other.
my view of open source-ness of bitcoin is like a newspaper
its free and open to read... but trying to get recruited to be an editor for the newspaper to change things in future releases is not so open