If I didn’t specifically opt in to receiving marketing emails (and no, failing to opt out is not the same), they are spam. I’ve never heard anyone say “I’m sure glad this company added me to their email list without my request.”
The fact that you happen to work on a mailing list product does not change that reality.
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I hear what you're saying, but irrespective of how one landed on such a list, the unsubscribe mechanism is broken. e.g. It's entirely possible and likely you've subscribed to one or more marketing lists, newsletters, transaction emails, etc that you want to be on, but your security software inadvertently unsubscribed you (without your permission).