This is a great policy but I think we have seen that the actual implementations of privacy preserving sentiments seldom play out in the favor of the public.

I think it's a better pattern to normalize decentralized identifiers (DID), wherein the process of unsubscribing is actually just the user revoking the unique identifier/alias that a company uses to communicate with them.

Lots of other cool use cases and benefits to this technology as well.

There's no privacy aspect. The article is about unsubscribing from (paid) services, not communication. Usually when somebody subscribes to a service the user gives the company their full address and payment information.