If any Bitcoin or cryptocurrency user is not aware of it, that user is very carelessly. Why I am accusing that user like this, it's because all exchanges, in Deposit page for a user account, after a user choose a coin, and a blockchain, there will be some information, address, MEMO (not all coins will have MEMO), and a minimum deposit value.

There is another way to check the exchange information on Min. Deposit, Min withdrawal, trading fees but this page can be missed or unknown by users. However, it's impossible that they won't be given information on a Min. deposit amount, it's only they are careless enough to ignore and don't read given information by the exchange.