tldr: they prove in real time that one man's terrorist is another man's freedom fighter
longer: the biggest three reasons to me are:
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they look the other way when their users are clearly using automated means to down vote & brigade leftist viewpoints.
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they block entire instances with viewpoints they disagree with through defederation like a nanny state instead of letting you make the decision for yourself as a adult.
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they ignore comments personally attacking leftists users even though it's against their own instance's rules, but are hyper vigilant on known leftist commenters.
i think there's plenty diversity outside of .world