The link in your emails has been restored. I fixed this under ticket WB-1543. We had assumed a web standard for unsubscribe links in Wildbook-issued emails, but it turns out that MailChimp (new) does it differently than MailJet (old), requiring different metadata where unsubscribe links are dynamically injected.
For future reference:
Unsubscribing is done at the MailChimp level (not Wildbook). Even if a Wildbook User wants emails, if they have ever unsubscribed, we would have to work in MailChimp to restore their access manually (if that is possible; MailChimp does a great effort blocking spam and malicious intent, which also means we have less control). As a result of testing, I have now locked myself out of two email accounts from receiving ACW emails.
After unsubscribing, currently users are just redirected to the ACW landing page. We can configure where a user goes (e.g., a custom “We’re sad to see you go” page) if needed in the future.