Again, I think you're implying that this contract is not enforceable. If that's the case, then my point is irrelevant. But that was not my reading of it.
> " you can't have a contract with an intended two-way exchange of obligations. "
> This is false, of course.
Except, not.
> You can have unilateral contracts accepted by performance of something that a contract requests,
You can have contracts accepted by performance as described, but they aren't unilateral. Acceptance by performance is a mechanism for demonstrating acceptance (hence the name) of a contract offer with mutual obligation while simultaneously fulfilling some or all of the obligations on one side.
> contracts implied in fact,
Which are contracts where the acceptance of mutual obligation (and perhaps the actual content of the mutual obligation) is inferred from non-verbal communication, not an exception to the requirement for an intended two-way exchange of obligations.
> contracts implied in law, and all sorts of interesting quasi-contracts,
quasi-contracts are another name for implied-in-law contracts, which are not actual contracts, but equitable arrangements; given the nature of the equitable basis for these -- particularly the direction they run -- it would be odd to see implied warranties, or even some equitable analog, mattering to them except to reduce liability that might be due to the provider. But equity can be be weird, so I wouldn't rule it out entirely that there might be some relevance there.
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