I've had to deal with "unsubscribe hell" from them and many others in the past. It's so frustrating.
The worst ones to me are the sites that you'll buy a random thing from, like an air filter for your home AC unit and then you just get a nonstop stream of daily emails about air filters, as if you exist on this planet for the sole purpose of purchasing air filters every day. They'll even send you emails about the latest 20% off sale conveniently AFTER you just bought one at the regular price. And then when you try to unsubscribe, it either doesn't work or their unsubscribe link goes to a broken page. I spend way too much time each month just trying to bring my inbox back to some level of normalcy.