Anyone want to take this as a research topic?
Sounds to me that with extensive (and well funded) research, we might
reinvent RSS and Atom. Spam filters are basically recipient side
opt-out, implemented at great expense, and I don't see any reason
that relabelling them as opt-out doozits rather than spam filters
would make them any more desirable.
In other media, there's enough friction and expense in the sending
process to make the senders of opt-out messages somewhat selective in
who they target. Since sending e-mail is within rounding error of
free, there's no natural friction and the natural strategy is to send
every message to everyone until they make you stop, thereby causing
the well-known scaling problems.
I was reading somewhere about the history of 19th c. telegrapny, and
there was a story about a carrier that offered flat-rate access for
a while. Whaddaya know, they had to switch back to charging by the
message because of all the spam.
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