> And before someone says that it's a scam, there's no outside investors in the Medallion fund anymore, so if it is a scam, they would only be scamming their own employees. And if that was the case, I think we would know.

There are other possibilities. For example shifting profitable trades that occurred in their external funds to their internal funds. In which case it is partly a 'scam' and they would not be scamming their own employees.