Ensure GDPR compliance by default (Article 25 GDPR – privacy by design
and by default). Under GDPR, consent must be freely given, specific,
informed and unambiguous [1]. We were subscribing users without
explicity consent, which goes against the "No pre-ticked boxes"
principle.
For compatibility with existing installations, we're using a setting,
disabled by default. Once we release version 2.4.0 we will enable it by
default, which won't affect existing installations but only new ones.
[1] https://gdprinfo.eu/best-gdpr-newsletter-consent-examples-a-complete-guide-to-compliant-email-marketing
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