Also myt last comment, unless a listowner somehow believes this is appropos for *this* list.
You're argument boils down to "it's not wholly effective, and it's super easy for the sspammer to overwhelm, so don't bother using it". The same is true of every blocklist, blacklist, firewall, tarpit, etc., ad infinitum.
Hashcash and tools like it are merely that: Tools. You should use your tools where they are most effective. if a tool does *nothing* then it's not a tool, and can be discarded. But a tool that works, just not perfectly, is what we have used to reach foreign bodies (moon, mars), build national infrastructure, etc.
Layered tools always work better than unlayered tools.
The fact that Mallory will always have superior firepower does not mean you do not go to war using the tools available: you simply apply these tools in an asymmetric manner. hashcash was specifically designed for asymmetric use - you can ask for anywhere from zero to infinite work from each connection,m based solely on your individual criteria. If it's a connection on a whitelist, you can ask for zero work, while also asking for highly significant (computationally speaking) work from unknown connections. Since the work is all done by the connection initiator, this scales well, and meets it's design goal of simply applying the most interference to those who have the highest likelyhood of being unwanted.
To dismiss this out of hand as the work of "clueless newbies" shows a certain bias. You may not *like* the idea, but HashCash is certainly not "clueless newbie" material. Look at the people who worked on this.
//Alif
-- Yours, J.A. Terranson sysadmin_at_mfn.org 0xpgp_key_mgmt_is_broken-dont_bother
"Never belong to any party, always oppose privileged classes and public plunderers, never lack sympathy with the poor, always remain devoted to the public welfare, never be satisfied with merely printing news, always be drastically independent, never be afraid to attack wrong, whether by predatory plutocracy or predatory poverty."
Joseph Pulitzer 1907 Speech