[MM3-users] Subscribe to a list on a Mailman3 server without account registration

Hello, I might miss something here but I'm confused about a difference between Mailman2 and 3.

On MM2 I just subscribed a mailinglist via my EMail address. I didn't need to create an account on the MM2 server first. But it seems on MM3 it is otherwise. For example I use MM3 on python.org. It seems I have to register first before subscribing to a mailing list. https://mail.python.org/mailman3/lists/twisted-web.python.org/

Is this observation correct?

Kind Christian