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by BecauseWeCan 4716 days ago
You have three groups, those who care strongly about seeing ${badstuff}, people who don't care enough to change the default, people who care strongly about not seeing the ${badstuff}.

By making it opt-out, you will get only those that feel strongly about seeing it. By making it opt-in, and following your query, you won't be able to separate those that really want to see it, from those that really don't care.

The group that doesn't care is big enough to make a difference.