That's the argument of Tarek El Diwany. From the second last paragraph of the article:

Some purists dislike the way modern sharia finance is run. Tarek El Diwany, a consultant, says banks are devising loopholes to sell nominally sharia-compliant products that are essentially the same as any other. For 1,400 years Islamic finance has been based on mutual ownership and profit-sharing, he says. But most sharia deposits return a specified rate similar to interest, not a share of actual profits earned. He describes it as “blank-faced copy-catting”.