Let's be clear.
I'm new to nostr.
I'm all for merit and genuine contributions.
in blockchain sense PoW is just an automated demonstration of a hashrate, computing power, hardware resources.
still could be used by financially motivated spammer/attacker to propell own agenda to feed.
so as a captcha that doesn't stop irrelevant posts it doesn't make sense. Allows Sybill 51% attack.
Web of Trust is when you as a user decide whos content you'll follow and is Publish/Subscribe model. Makes sense.
in rostra for exemple there is extension where you can follow/subscribe only to certain parts of personality/areas of individual like #movies or #cooking where you trust them to publish high quality posts, and not #politics for example.
In nostr there is 2 layers of #WoT that may filter : A relay & a client (via friendlist) .
A #Hyphanet also rely on decentralized WoT. And it does work for 25 years. Web Of Trust doesn't mean a blockchain by itself per se. It's more of a keychain. See the difference?
#Etherium you mentioned is a PoS , Proof of a Stake. probably with optional WoT on top, since it could be their second time either reversing major transaction or forking. But discussing this would belong to separate #ETH thread. I'm not of a big ETH expert, but willing to learn.