Just curious, what’s the site called?

That’s not entirely true. The publisher can still set some rules around what they want to allow, like no gambling, etc.

Buddhism has some interesting takes on this. In particular, I really enjoyed The Tibetan Book of Living and Dying, written by Sogyal Rinpoche.

This means that the sender includes a list-unsubscribe header, which is supported by a lot of email clients. Not sure if StubHub does this, but it’s worth checking.