You seem to perceive spam control very differently from how I do. The blacklisting services will generally put their blacklists into different domains based upon different selection criteria, or will provide different return codes to enquiries for different blacklisting reasons. In either case by giving the user of the blacklist information about how the blacklist is composed, it then is the choice of the user to decide which blacklists to subscribe to and how to use these.
In particular the responsibility for blocking spam isn't that of the blacklist provider. All the latter do is to publish information about their opinions as to the reputations of different email origins. Are you objecting to the right of blacklist providers to publish their opinions ?
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