When setting up a profile for people to subscribe to a newsletter, in the 'Settings' area next to the Recaptcha box there's a blue help bubble which says 'Do not enable this feature if you are using this profile as an HTML Form Snippet embedded in a non-CiviCRM web page. reCAPTCHA requires dynamic page generation. Submitting a stand-alone form with reCAPTCHA included will always result in a reCAPTCHA validation error.' Is this really the case? I noticed some answers on here telling people to add Recaptcha to profiles to avoid spam.