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It is gameable and worse unless it is based on the individual. It should not be some global score, but a score based on my own choices. i.e. show me a reputation score based on who I follow and trust - not on who the world follows and trusts. Then I can publish my reputation scores - and you can come look at them to inform you further.
How about being able to open anyone's WoT at any time and view their 1-2-1 scores in a graph view (like Obsidian) but with different coloured connections, showing which people trust them (green), don't trust them (red) or haven't made a choice yet (grey).
You could also filter the people who you fully trust and aggregate the person's score from them only, to help you decide for yourself what level of trust you want to give them.
People could change their trust vote at any time.