Back when I was first enchanted by this essay, I most closely tied it to the caller ID phenomenon: first, the phone companies offered, for a price, a caller ID option so one could identify who was calling; but then, if you wanted your identity blocked, you had to purchase an option to counter the caller ID option purchased by someone else; and then, customers were given the option of blocking calls from people who blocked the caller ID function; and also, there was caller ID trapping, where the recipient of a caller-ID blocked call could forward the call to a toll-free number (where caller ID could not be blocked) to get the info anyway.
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