I believe OP is referring to the native WordPress registration.
New to WordPress. I just received an email indicating that a new user registered with my site in the role of “subscriber.”
I’m puzzled as to what motive anyone might have to be a subscriber vs. a contributor or author.
The puzzle is simply explained as thus:
“Subscriber” is the DEFAULT user role assigned to anyone who registers on a WordPress site with registration enabled, unless you have specifically changed this. And during registration, people are not presented with the option to select their preferred role — again, unless you’ve specifically setup your site as such.
So everyone who registers on your website will have the “Subscriber” role by default.
I’m puzzled as to what motive anyone might have to be a subscriber vs. a contributor or author. According to WordPress, a subscriber is “somebody who can only manage their profile.” What good would managing your profile be, if you’re not going to use it to comment, etc.?
I think there’s some misunderstanding here as to what “contributor” refers to.
The various WordPress roles (Administrator, Editor, Author, Contributor & Subscriber) relate to permissions to publish NEW CONTENT (posts, pages, etc), manage existing content, and manage other users, and configure the entire WordPress website.
They have nothing to do with the ability to post comments.
Every registered user (irrespective of role) can post a comment. And, by default, even unregistered users can comment: they only have to provide their name and email address, but they don’t become registered users automatically after leaving a comment.
With all that said, I’m 99.999999999% sure this is a spam registration.
See: https://www.elegantthemes.com/blog/tips-tricks/how-to-defeat-wordpress-spam-users-identify-delete-and-prevent-future-registrations