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Adding that much friction is also going to loose you many genuine users. Might be worth it depending on the community but if it makes newcomers fewer than your usual churn rate its a death sentence.

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I think a better approach would be to upload an image to the sign up form with explicit instructions that isn't in text on the page to be easily read by AI. Like "Answer 2 in the Math captcha" even though the correct answer is 5, the AI will always enter the wrong number.

That would work for a time, like with Captchas. Then the AI would overcome it and you'd have to come up with a new idea.

True. To be fair, this was a reply to a comment about a niche community.

Though it's possible that this approach could become normalised if it's proven to work at a small scale.

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