These exchanges are built on a unregulated space with a lot of loopholes in them. So, we cannot really do anything about it. It is an unfair practice and very frustrating for the community but if you follow web articles closely, you'll see that these accusations are mainly against OKEx, Bitfinex and Kraken. However, GDAX and Binance are still reliable for the users as they were more accurate
Maybe GDAX -- I think they
mostly play by the book. I've also seen some analysis of Bitfinex trading metrics that suggest they are mostly legitimate too.
But Binance's volume is likely manipulated. I follow lots of traders on Twitter and many people suspect fake volume because of the lack of order book depth. Same accusations you see towards OKEx. And remember, CZ was the mastermind of Okcoin and Okcoin futures trading engines, which were notorious for faking volume. You think he wouldn't work that magic at Binance, too?