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If you’re looking for longevity, “free” should be the last thing you’re looking for. An agreement without an exchange of value is not an enforceable contract, and so any free service can be revoked at any time, even ones that promise they are “free forever”.

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Enforceable where? How? An agreement with an exchange of value is not always enforceable either. So, although I too hope exchange of value would add more legitimacy to an agreement, it is not always the case.

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