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Never understood the reasoning. What’s their motivation to slow walk it? Are they trying to get in 2-3 more spam emails before you are unreachable?
I swear it doesn't even work sometimes!
It definitely does not always go through. I usually end up unsubscribing by any means available and blocking emails on top of that
Assuming they do it correctly, you get added to that brands unsubscribe list. They then need to share that list with all their email partners. The email partners download yoaded lists once per week, so it can take that long to stop receiving emails.
If it's a site that does all their own email you shouldn't get any emails after unsubscribing.
There could also be two unsubscribe links - to be for the brand and one for the company emailing you.