Recital 48 is giving some explanation:
"The processing of personal data for direct marketing purposes may be regarded as carried out for a legitimate interest."
https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CEL...
IANAL, but I spent the past 2 years as CTO of an EU-based analytics company becoming compliant with GDPR, and consider myself quite informed on the topic. I would tread more carefully than what you are suggesting.
Embedding implied consent to such tracking in a separate document (privacy policy) does not seem to be very transparent. What am I misunderstanding?
PS: It's usually better to have a look at the GDPR on the official website of EUR-Lex. https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CEL...
But, MailChimp allows open-tracking to be disabled. So, that wouldn’t seem to be a required element of their processing. Which means it’s for the controller to decide. I don’t understand how article 7 of the GDPR allows for email tracking to be immune from explicit consent.
Q: "Does Mailerlite allow me to disable open tracking and click tracking for the purposes of GDPR compliance?"
A: "Email tracking is not forbidden by GDRP. We just recommend to update the privacy policy that clicks and opens are tracked in the newsletter they get."
Maybe one day a prosecutor will use a database schema as evidence of GDPR violations...
These metrics are fairly essential if you want to be sure your users are actually receiving your content, and what content they are relating to in order to improve your content.
Since providing relevant content which actually makes it into your users’ Inboxes is the whole point of a newsletter, it seems like ensuring that is actually happening is a core part of the service.
But I am not a lawyer, and I am certainly no expert on GDPR.
Simply because the industry has molded the competitive landscape in such a way that tracking can be deemed "essential" does not, in my mind, make their behavior and actions immune from consent. But, I don't doubt that they could make that argument and win.