Economists have called that “dark patterns”. It’s a type of sludge that makes unsubscribing incredibly hard to do. That obviously makes one more inclined to keep the subscription or just say “forget about it”. It’s a whole little niche of behavioral economics and phycology.
https://en.wikipedia.org/wiki/Dark_pattern?wprov=sfti1
Email marketing campaigns are often queued up days/weeks in advance, set up in the system that sends them with lists of recipients attached. Because your unsubscribe removes you from the main customer/lead database but not already set up campaigns, the laws allow some delay from unsubscribe and actually being removed.
It can similarly take time to get added to the regular email sends but you may get a sign-up confirmation and automated series of welcome emails once signing up to list.
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