Imagine I create a new account on lets say KuCoin. I create a ether/erc20 address and I send an amount in ERC20 tokens to that address.
KuCoin then sends that to their mainwallet. How do they do that if there is no ETH on that address.
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There are a few possibilities. Either they just have ETH on that address, they have already
approve'd another address (they're "sweep" account) to transfer for them, or the receiving address is a contract that they call with their authorized sweeper and the contract just transfers to their storage account.