I'm not sure why people would be wary of clicking the unsubscribe link on something they explicitly subscribed to in the first place. I mean, they trusted you enough to give you their email address to subscribe in the first place, right?
The only scenario I can think of is when people didn't intentionally subscribe or were coerced into subscribing and those newsletters can go to hell and fully deserve to be marked as spam.
The only scenario I can think of is when people didn't intentionally subscribe or were coerced into subscribing and those newsletters can go to hell and fully deserve to be marked as spam.