I'd be happy to update it with more correct information if you can find more accurate numbers.
From https://fedipact.veganism.social/ the largest instances in order of active users are:
- Lemmy.world - Federates
- LemmyNSFW.com - Blocks
- Lemmy-ml - Blocks
- Lemm.ee - Blocks
- programming.dev - Federates.
Lizards were created by boomer turtle parents selling the family turtle shells to spend the rest of their lives on a cruise ship.