You're definitely wrong
If it didn't work with a simple threshold for what difficulty level is needed to join the web of trust, it would just need a simple formula accounting for things like whether there are any links, as I said before
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Yes, restricting PoW to users outside the WoT is a thing, and makes somewhat sense.
But still I don't understand why not captchas or similar in this scenario. These are more effective than PoW, as they burn human mental resources, not just cheap CPU cycles, and are hard to automate.