I'm very surprised to see you are being downvoted, I was convinced everybody is doing that. Spam is spam, period. Asking me go click on a link that leads somewhere is just a waste of my time - and there are still a few culprits out there who instead of unsubscribing me straight away demand that I log in to "manage my notification preferences"!
After feeling gaslighted by some spam emails that I was very sure I had unsubscribed from, I started keeping a spreadsheet to track my requests with date, and what link I followed to get removed. Almost 25% of my requests have never been honoured, it's disgusting.
But when you have dozens of databases, each owned by a different company, and they feed off each other perhaps once a day, then you can end up with a long time before all your data is deleted.
