Not letting you unsubscribe
Usually when I get clearly spam email, there is no real option to unsubscribe. Sometimes there is a link at the bottom of the email, but I will always avoid using it because that will more than likely confirm that your email is legit in that it goes to a real person and is actively used (if they haven't already confirmed with a pixel tracker). But for actual businesses which desire to have some air of legitimacy, the unsubscribe link usually works and is generally the best way to stop receiving unwanted marketing mail. However, I have noticed periodically that some companies have the unsubscribe link but nothing really changes when you unsubscribe... Today, I confirmed that with DHgate, a rather large online retailer mostly offering goods from Asian markets. When you click the link to unsubscribe, it takes you to a page where you aren't even able to actually unsubscribe, you can only reduce the frequency of emails. However, when I selected everything, I was still receiving emails in my inbox at what seemed to be the same frequency.
I find this behavior strange, though not unexpected in this money-driven world. It's strange to me because it appears that this company whole-heartedly believes that their decision to not actually allow people to unsubscribe will ultimately be in their best interests (i.e. lead to more sales). Companies follow the money, so it probably is what earns them more money in the long run, but that's strange to me because if I felt a company was being spammy with marketing emails and if I tried to unsubscribe but they still kept sending me emails, I would assuredly never buy a product from them again. But it seems I may be a minority in thinking that way, since this relatively large online retailer has chosen to do it anyways. 🤷♂️
The solution to always having control over your email
To avoid this kind of stuff, you can use Firefox relay which is built into the Firefox browser. It lets you use randomly generated email aliases to use for various newsletters or product signups, and once you no longer want to receiving emails from that service, you can simple delete the alias. Technically you can still use Chrome and just open Firefox to generate the relay emails, but overall I would probably recommend Firefox (along with uBlock Origin & HTTPS Everywhere) over Chrome for privacy-related reasons.