It would seem that "Wash Trading" is a much bigger problem than originally thought. Wash Trading is the buying and selling of coins by bots on the exchange to artificially create volume and the perception of liquidity. A new study shows that only 3 of the Top 25 exchanges trading Bitcoin according to CoinMarketCap are actually presenting true figures. https://cointelegraph.com/news/report-claims-over-80-percent-of-top-25-btc-trading-pair-volumes-on-cmc-are-wash-traded
Including binance, houbi pro and okex exchange are all wash trading.. the most legit exchange volume today up in the crypto space is still bittrex