lopps solution works because spammers dont care about his blog specifically. When Google replaces their (re)captchas with PoW it will fail within a week.
This is not an "us versus spammers" POW, it's suggesting that clients must provide a POW in order to submit a post, as nostr:npub17u5dneh8qjp43ecfxr6u5e9sjamsmxyuekrg2nlxrrk6nj9rsyrqywt4tp laid out here:
https://blog.lopp.net/protect-contact-forms-from-spam-with-proof-of-work/
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