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From MailChimp's website

http://kb.mailchimp.com/reports/about-open-and-click-rates

And: https://blog.mailchimp.com/how-gmails-image-caching-affects-...

I click on a lot of emails just to find the unsubscribe button, and sometimes open-archive is the fastest way to get things out of my inbox

The emails were sent via Mailchimp, the open rate was gotten from Mailchimp's reports (analytics).

Yep indeed it's faulty: https://blog.mailchimp.com/how-gmails-image-caching-affects-...

I wouldn't say its faulty. They clearly said unique open rate is even more accurate now. The only thing that suffered was seeing multiple opens from same user. Which I feel is far less interesting

These numbers are usually overstating I find, likely a lot less people actually read the email.

So, this just counts broken email clients that load external images in email (which, I suppose are a lot -- but they're still broken, IMNHO).