I think they are suggesting that the exchange would use bot accounts, exempt from trading fees.

Not for the people running the market.

Even if they did pay it they would be collecting their own vig

You gotta spend money to grift money.

You need to work on your grindset - Washing is cheap when there's a 5% sales commission.

A low price to pay when you're laundering money, which is the only real NFT use case.