I think I’d you mix POW with WoT you can get a sweet spot that is not costly; spammer and new user start from zero reputation but they should quickly differentiate themselves and the required POW can decrease as their WoT increases
WoT?
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Web of trust
“I know you’re a human, I vouch for you X”
“This npub writes interesting things I vouch for it X/50”
I see. There’s a lot more arbitrary design choice in that kind of system, but hopefully someone will figure it out