Cigarettes? Newsletter? Substack?

Seems like every post of advice for aspiring authors is that they should have a newsletter, so does that sound like a good idea? I don't know how many followers I have, much less how many of them are bots, and this isn't exactly a blogging platform. Tumblr's dead, Twitter's... X. So if anyone's going to hear what I think about movies, it might as well be in e-mail.

Me, I don't go in for newsletters personally, I have enough to read, but you tell me, people, would you want to hear about my writing process or is the odd book exposure enough for you?