@willd- You can easily check functionality by importing your own Stellar account. This tool does not ask for your private key, so it can't really "scam".
Last couple times I checked (including now), the leaderboard is populated. If you want to catch me on Slack, my ID is Xiao Ming. Thanks!
Piggyback update on strader- We just noticed and fixed an issue with ROI computation on accounts with assets transferred (not traded) in. As always, thanks for the testing and feedback :-)