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You can always track signup/paying-users ratio. Purpose of landing/pricing page is to get the users to sign-up. Unless some dark pattern or misinformation is used to confuse users into sign-up, more users is a positive thing.

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The problem with A/B test optimization is that, unless you're extremely careful, they naturally lead you to apply dark patterns and misinformation.

Ok, but the example we're discussing is one where the signup button was simply moved to a different position on the page. That's not a 'dark pattern'.

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