Not in "real time": blockchain settlement has to wait for a block. And you incur on-network transaction fees plus whatever fee the exchange imposes for transfers out.
(Besides, many people are "day trading" on these exchanges because it's a form of addictive gambling)
Oh and then there's "staking": https://ftx.com/staking which encourages people to keep tokens on the exchange by pretending to pay them interest rates. And offering various other multi-level-marketing incentives. I see "Free Daily ERC20/ETH Withdrawals : NaN" on that page, which is fun.
(Besides, many people are "day trading" on these exchanges because it's a form of addictive gambling)
Oh and then there's "staking": https://ftx.com/staking which encourages people to keep tokens on the exchange by pretending to pay them interest rates. And offering various other multi-level-marketing incentives. I see "Free Daily ERC20/ETH Withdrawals : NaN" on that page, which is fun.