I have been subscribed to so many marketing "newsletters" without my express consent, either by a deliberately confusing registration processes that successfull

I have been subscribed to so many marketing "newsletters" without my express consent, either by a deliberately confusing registration processes that successfully tried to sidecar the newsletter upon registration using some combination of checkboxes, or straight up silently added out of nowhere just because we had a business transaction once. This is spam as far as I'm concerned since it's unsolicited marketing, but often still honors List-Unsubscribe standards. Sometimes it's understandable that someone wants to simply filter these mails as spam than go through whatever convoluted process they have in mind for unsubscribe. It's easier and discourages the practice of signing people up to random newsletters.