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Disadvantage: this site does nothing to make cryptography more accessible / easy to use for the common person.

Accessibility should not introduce a SPoF.

What happens when Snowden uses it and the USG requests access?

Oops.

Businesses / nonprofits cannot provide privacy-as-a-service unless they're "SWAT proof" (distributed).

Advantage: SKS is "SWAT proof."

Try https://encrypt.to/ to send encrypted messages by one click :)