There are some exchange that manipulate trading volume but I don't believe everything about the forbs publishing, any one can wake up one day, make some few research and off they go, they are in the press to publicize. I recently read on the news publication about a computer scientist who claims to be unknown Satoshi Nakamoto the  Bitcoin inventor. Owing to that fact, I can't believe 100% of the claims made by forbs about the trading volume for Bitcoin in exchange like binance, MEXC