After checking the achievement notification, I was presented with this:
Context: I still have an account after using PDS to alter/remove all my posts and wiping my profile, but I still get messages from redditors seeking help so I check in from time to time.
Wow, looks like the facebook tactics are creeping in. Fb started notifying users to pull them back on the platform with “x person commented on y person’s post (that you’ve never interacted with)”, and half the time those notifications didn’t link to the post, and you couldn’t turn them off. I’m not sure how that brings people back at all.