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A couple issues with this:

many topics tend to bleed across niches

sites themselves will change purposes over time

how sites are monetized (and other user experience choices) may change over time

people buy and sell sites

sometimes the desired information is only accessible on sites which are not particularly popular because they are not aligned with moneyed interests

sometimes sites that are popular might be popular because they are inaccurate, conforming to an expected + desired bias

if the whitelist is black and white, entities may change their approach after being well trusted (one of the elegant aspects of Panda is how it can remeasure over time)

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