However, by and large, this is not the case. There are isolated communities in which encryption is used, whether out of ideology or out of necessity – Bitcoin itself has a considerable number of pseudonymous businessmen and developers who rely on PGP to maintain their online identities. For the encryption to be worth anything, your friend would need to have a decryption key under his control, whether that’s a public key or a symmetric key that the two of you had agreed upon earlier, and convincing other people who are not as technologically inclined to use such keys can be a challenge. If you were to create an encrypted email right now with PGP and send it to a friend, they would have a difficult time figuring out what to do with it. Some argue that the reason why encryption has not been implemented into email protocols is profit, as Google would have no way to earn advertising revenue from their service if they could not scan users’ emails for keywords, and others cite general apathy, quoting Mark Zuckerberg’s famous comment that privacy is no longer a “social norm”, but there is also a more fundamental issue at play: network effects.
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