Satire?
Often times, the spammers pose as PayPal and Pinterest, or any 'big name' that a lot of people sign up for, or think they might have. I get them from impostors once in while (they go to my suspected Junk in gmail), I look at them with graphics off to check, and those get trashed.
And not all of them are the poorly written, obvious ones. I got one from "Amazon", it looked just like the emails from the real Amazon, it had valid links to the graphics on Amazon.com, but.... It didn't start out "Dear Mrs. ERD50 (the account is in DW's name), and every legitimate Amazon email has that personal info. So I trashed that one. Had I hit 'unsubscribe', some spammer would have added me to their 'active' list. And maybe I'd be blaming Amazon for not unsubscribing me?
I can only share my experience, I've never had an issue unsubscribing from any legitimate promotional email from any legitimate business. Maybe others have, I don't know, but I suspect those 'promotional' emails were spammers in disguise.
-ERD50