I agree with this. CMC rates the exchanges on the basis of volumes trade which could be fake. They have no way of verifying it perhaps?
Verifying could be limited only by looking at what the exchange will provide, so if the exchanges shows they have 1 billion 24 hours volume, then its the volume that will be listed in CMC...
If people understand how programming works, they will understand why CMC only provide data that is available in a certain exchange.
and that's the only way on how CMC provide an update data because if they'll verify further that will take time and that will not be able to provide as timely information.