I read in the WSJ today that Alameda had indeed done price arbitrage trades on the FTX exchange. The closeness of these two firms should have raised questions I think. I really don't know a lot about it because I was never involved in either FTX or Binance. But I think most financial journalists are trained to spot disincentives and corruption that come with marrying trading firms and exchanges. So I am surprised that did not happen leaving aside other questionable items.