Zero trading fees on Bitfinex exchange

Recently Bitfinex exchange has made all trading fees equal to zero and majority of withdrawal fees are zero too including USDt. This is quite big exchange and I am using it since 2018 without any problems, but their new business model is puzzling me. How they are going to make any profits?

AI tells me that they may make profit on a bigger spread, but this would be an arbitrage opportunity and anyone could make profit by undercutting them. So I am really puzzled.