An email list is directly connecting with a potential fan, more than (most) social media posts. With this, you can keep them in the know. Also, I've been told that labels LOVE THAT ****! I mean, they swallow it whole (I don't like how I phrased that). So how do you get someone's email without being too invasive?
How are these terms defined? Everyone has their own schedule. It is determined by open communication. Someone isn't wrong by not wanting to commit an undefined (or a schedule sculpted a little too well) amount of time.