One thing you apparently can do right way, as a simple subscriber to god-knows-how-many newsletters handled by mailchimp, is to go to: https://mailchimp.com/en/

One thing you apparently can do right way, as a simple subscriber to god-knows-how-many newsletters handled by mailchimp, is to go to: https://mailchimp.com/en/privacy-rights/ https://mailchimp.com/en/privacy-rights/ And at the very end send the form request a "Data Analytics Opt-Out" (and if you want, a data access or even data deletion right away). There's a decent chance that what they're doing is illicit under the gdpr, but until someone files a complaint and they get fined, this is a concrete action. Maybe ask your newsletter providers to switch from MailChimp as well, if you can dig out who they are...