A while back someone left this in a coffee note: could the drive be randomly fragmented, so you actually watch it get cleaned up instead of replaying the same tidy animation?
It's live. Every defrag now starts from a fresh, randomly scattered mess, so no two runs look the same. The blocks you're snapping into place are different every time.
Go break a drive and put it back together: https://defrag98.com
Thanks for the nudge, and thanks to everyone keeping the coffees coming.