Only three exchange among all the exchange have accurate volume, and binance is one of them most of them give fake market value and at that end up scamming there users. We all need to be careful about fake exchanges around.
I wonder if manipulation does not contribute to fake volume? Not that I hate Binance but I guess you are overrating Binance by stating it has accurate volume. Are you sure there is no wash trading happening there?
It seems, being shady does not mean it is a scam exchange, unless that exchange took all our deposited money and run away.
Fake volume had been part of any exchange, they cannot control traders that buy their own sell wall, or eating their own buy wall manipulating the volume of their supported coins. It is that, some exchanges do it themselves to attract more depositors, do a conspiracy with certain token getting commission from that activities. It is business, often times things are "settled under the table".