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Doesn’t compute.

He probably meant that “customer” is not making him money, therefore not worth the time. The only reason unsubscribing works at all is probably a legal requirement.

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It does, probabilistically. For any given customer C, the expected value EV(C) is... not much. By starting an opt-out process, a customer Co is revealed to have EV(Co) = 0, which is less than not much.
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Though it's making the other customers statistically more valuable.
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