That reminds me of a story by a former coworker of mine, who had a xing account and repeatedly asked them to not send me him ads and spam e-mails. They ultimately closed his account.

Some companies are so dead set on doing this shit, that they don't even have mechanism in place that would enable them to act upon you opting out. It is a sign of dysfunctional companies. You can also observe this, when you send companies a GDPR request for deletion and they do eeeeverything to not have to go into their shitty system and delete the data, because that would require them to do manual work.