I've seen this question asked before, but with varying perspectives so thought I would throw this out again.
We have multiple workspaces with each workspace essentially defined as a product. If possible we would like to find a way to have each workspace have it's own unsubscribe token or link. From what I've read it doesn't look like there's many options for this type of implementation.
We do know of the option to have a field specific to each workspace that could act as an opt-in field, but due to specific circumstances, this would be difficult to implement across the instance.