Profit and loss are equally shared in Islamic banking
Islamic finance transactions are based on the concept of sharing risk and reward between the investor and the user of funds. For example, in conventional banking, the premium paid by the Customer is lost in case of an accident, and the car is completely destroyed whereas, in Islamic banking, both banks and Customers share the loss and a certain amount is refunded back to the Customer after settlement. This is just one difference, there are many other differences.
What makes it halaal or haram is the “Contract”, wordings are important,
Concepts and instruments are Islamic. The issue is about their application. Usually, Islamic banks are applying them for their own profit.