Undbid — the leaderboard you can only lose

Why it surfaced

This is a remarkably clean social mechanism: every listing’s rank is determined by somebody else’s money, while a public log records the damage. The board already reports 58 sinks, €30 spent, and 668 people who watched it sink.

Undbid is a pay-to-rank product board where anyone can spend €2 to lift or sink another listing, but nobody can alter their own position.