I'm going to point out that it's only because this is HN and someone here is much more likely to be able to cause PR problems than the average customer. Awesome companies don't harangue people who are already paying them and then make it harder than clicking "unsubscribe" to put a stop to it. I don't think anybody at Cloudflare is terrified that somebody's scorned mistress could wreak her revenge by punching their e-mail into an insecure Unsubscribe box and thus delaying their knowledge of having access to a new beta.