I figured it was probably an automatic promotion based on meeting some criteria, but it also gave me an opportunity to give you some grief. 
Yeah. Like that. 
I noticed that when I scrolled the list, 'cause they all have BADGES! 
Thanks for sharin’ the default Discourse criteria for the level-up. This is the only Discourse-based community I’ve used (so far), and I enjoy learning about the platform.
I appreciate your being a good sport. 