Indeed, This is a funny thing when someone will refer cmc for depend trading volume and considering projects liquidity. You able to focused only bibox exchange but you know there are many exchanges volumes are fake. Latoken,Vindex,p2pb2b,Exrates i would to told that its a 100% wash trading. Bibox is better from those terrible exchanges.
I don't think we can completely blame Coinmarketcap, because it only displays data from an exchange, I think if there is a fake volume or anything like that we have to find out for ourselves.
For me, data at Coinmarketcap is often inaccurate and you should update yourself by looking at its liquidity. In fact, the trading volume cannot tell anything and people are only interested in the liquidity of the coin.
Personally, I usually choose coins that are in the top 10 CMC for trading and only use CMC to know exactly what is happening at that coin.