Is it that onerous for folks to maintain their own whitelists? Chances are, most people spend 80% of their browser usage in 20% of sites visited. They couldn't

Is it that onerous for folks to maintain their own whitelists? Chances are, most people spend 80% of their browser usage in 20% of sites visited. They couldn't be widely shared, but they're less whack-a-mole in practice and from a security perspective, a more superior solution.