Maybe their mindset should really be, "Hey, we're annoying 99.95% of our users who did not consent to these emails, and > 50% will be turned off to our product and will associate our brand to that of a needy, attention-grabbing parasite".
If I wanted these emails, I would have opted in.
Instead, not only do they automatically opt you in, but they'll re-opt you in after you've unsubscribed. I've had it happen a year or two later; suddenly, I'm back on their spam list.
It's become so bad now that I can't even let a shopping cart sit anymore without getting a nagmail saying "HEY YOU NEED TO FINISH CHECKING OUT NOW1!!!".
That email is the reminder to empty my cart and never do business with them again.
Seriously, STFU and leave me alone. If your sales and marketing team insist on these tactics, you need to fire them and hire people who get it.