Possibly they focus on accounts with icons attached to their names. Mine seems to begin being tracked sometime after a mod decided I deserved a pepe. Had not idea at the time they considered me worth having one, and we had a mod who would take icon requests for a while.

Also it could be other Anons here, though I would assume those anons would want to track discussions vs people. Once I found a few key discussions (I had saved for future reference) were deleted when a user deleted their account, I began saving some discussions & posting a comment in the threads with archive links to be able to recount what was discussed of the OP ends up deleting their account at some point.

I was once told that high profile/upvote anons will delete accounts due to direct threats or simply being done wading through BS tied to the specific account. Unfortunately that also deletes the post histories with a wealth of good knowledge.