Assuming perfect win rates are a primary signal for insider trading uses a lot of finite attention without accounting for crucial exceptions. Some market players, like the market maker or an arbitrage bot, will naturally show exceptional win rates because of their structural advantages, not illegal insider info. Chasing every high-win-rate account would drain our scarce resources investigating legitimate operations. For example, my brother's friend runs an arbitrage bot for currency trading here in Dakar; his wins are near-perfect, but it's just quick math, not secret knowledge.