What is the ruling on depositing money in a savings account with Crédit Agricole Egypt and receiving an annual return whose percentage is not predetermined?

A savings account in usurious banks is forbidden, as it is a usurious loan with interest, so it is impermissible to open one. As for a savings account in Islamic banks, it is based on legitimate Mudarabah (profit-sharing), where the bank invests the money, and the profit is distributed according to the agreement. The bank does not guarantee the principal or pay interest if there is no profit, and the owner of the money bears the loss without transgression or negligence.