That feels very "20 years ago" to me. They've got plenty of other ways. Don't get me wrong, I'm a bit careful with them but because I'm used to being signed up to lists by a handful of stupid people who don't know their email address, I can basically anticipate what regions of the world my spamlists will come from, and I generally have a good feel for what's legit or what's not. I use the unsubscribe link often for these things.