This is the real secret to predicting markets and insider trading profits. There are a large number of insider addresses on Polymarket, but they are difficult to analyze and catch in advance—they are only discovered after the fact—someone profits abnormally—draws attention—and then is traced back. This means you'll never get a second bite: by the time you know the insider address, the next one won't be the same insider address. However, there is a signal that can be quantified: insider addresses are almost always new addresses.