I noticed that Binance exchange created an unique address for every user to deposit ERC20 tokens. after the deposit, Binance transfer those tokens to a specific address, which is marked as "Binance"(should be the cold wallet) on etherscan. here is the address.
the whole process looks like this:
step1: user's wallet => user's address at Binance step2: user's address at Binance => Binance's address.
my understanding is: step2 costs gas too and Binance paid for it.
is that right? for now the gas cost for every Ethereum transaction is about 0.0011298ether.
so every deposit from user, costs Binance ether?
if there are many small deposit, then there could be a lot of gas cost on the transfer of step2.
what is the benefit of this?
is there a better way to avoid the extra cost?