"event-updates-opt-in" needs (by law) to be a double-opt-in for Germany

[carstingaxion]

Describe the bug

The current behavior of opting-in new attendees automatically into the emails subscribers conflicts with german privacy laws. By german regulation this process needs to be a double-opt-in.

Apart from Germany, double opt-in isn’t strictly required in any other European country, but it is considered a best-recommended practice in countries like Austria, Norway, Greece, Luxembourg, and Switzerland.

• What Does Double Opt-in Mean And Which Countries Require Double Opt-in Consent? - Securiti

Steps to Reproduce

1. Create a new user & log-in as such
2. RSVP to an event
3. Edit your personal profile under wp-admin/profile.php
4. See ✅ Yes, I want to receive updates and information about events from the organizers. to be checked.

Screenshots, screen recording, code snippet

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Environment information

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WordPress information

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Code of Conduct

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