yes most of the tokens are fake, there are even some exchanges with large volumes that are also fake.
so I started to doubt the newly released token in cmc because the data is not necessarily accurate.
but for coins like btc, eth and other top ranks no different.
some altcoin tradiing volume if compared with buy or sell order was not suitable with reality. most of exchanges provide fake tradiing volume, and maybe its happen when cryptocurrency price hit on all time high on 2017. people interested when they see suddenly cryptocurrency price rise extremely in market. but for major altcoin ,its not significant.