I will however complain that I shouldn't have to recaptcha myself if I took the time to enter my email address, find the email, and click confirm for it. What benefit is there to recaptcha-ing that?
My complaint is in hopes that they will remove that recaptcha for other users who happen to like their privacy and don't let their browser sell everything to mailchimp.
Edit: I will correct myself in that it looks like they may not have a choice according to https://mailchimp.com/help/about-recaptcha-for-signup-forms/