The part people miss about these 'insider' Polymarket trades is how little capital it actually takes to make these kinds of returns on binary contracts. On most non-headline events the orderbook has maybe 5-10k of depth at the top of book. A new account dropping 50k into a 5-cent yes contract right before news breaks isn't sophisticated -- it's someone with information and a Metamask wallet. The CLOB structure makes it trivially easy to trace these wallets on-chain though, which is arguably better transparency than you'd get in trad finance.