But you missed the biggest implication. I have to be online in order
to receive a request. Not only that, I have to be on the internet.
Actually, that's not quite true is it? MKD didn't say:
potential sender must "request" "permission" to send to a receiver
*and this permission must be sought directly from the intended recipient*
It's possible to envisage a system where permission might be sought from
an entity (acting for the receiver) which IS (usually) "on".
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