Thanks for the info. Based on it, and other info I’ve since read, there is no reason at all to check the box in general settings for “anyone can register.” This just opens you up to spam. IF unchecked, you can still add users as you want. Users should only be those who contribute to the site, either by posts or comments. If you have a site that allows comments (I don’t), then Jetpack Subscriptions won’t be enough. You’ll need to sign them up as users, but never select “anyone can register” as it just opens you up to spam. Rather, have people who want to register email you and do it manually. For simple subscriptions, just use Jetpack Subscriptions. Right?