Is leverage in foreign exchange trading, which does not alter the brokerage company's profit margin from the bid-ask spread and does not involve fees for overnight positions or for the leverage itself, considered among the loans that yield benefit?

"Leverage is a loan from the brokerage firm to the client, conditioned on all transactions being conducted through the same firm. This arrangement brings benefit to the lender (the firm) due to the commission, which increases with the volume of transactions. Therefore, it is impermissible to engage in transactions using it."