I take your point, you're not wrong.
Having worked on a large marketing email delivery platform, I can tell you that the _potential_ delay in removing a subscriber from an email list is a process problem and not a technology problem.
In many orgs, the list of recipients is determined early in the lifecycle and never revisited / culled for recent unsubscribes. And the lifecycle can be long with approvals and scheduling.
Last step s/b check unsubscribes, but often it's not.
[@suethepooh](https://mastodon.social/@suethepooh )