Captcha or Attestation doesn't remove the need of moderation. In case of a botnet, an elevated complaints of user device engaging in fraudulent activity can lea

Captcha or Attestation doesn't remove the need of moderation. In case of a botnet, an elevated complaints of user device engaging in fraudulent activity can lead to disabling attestation and trigger an investigation. Every iDevice being a member of your site can happen only if you are Google, other than that what you'll see is that some users will engage in shady stuff and blocking them will be enough to keep them out since they wouldn't be able to just sign in with a new account. These things are always cat and mouse games.