You see interest on withdrawal on lines relating to electronic means of payment. Given the statement of the broker, we conclude that the interest relate to the work of the sites themselves. That is, the interest for withdrawing cash from an electronic wallet. The broker takes care of its clients, informing in advance about the possible costs. That's all)
It's just that the standard account has a big minimal deposit. There are no crypto on the cent account, and if there was a cryptocurrency account, I bet it would offer crypto. Usually cryptocurrency accounts don't require large deposits.