It isn’t credit that makes them the money. They make far more money on transfers of money. There is far more being made with international transfers than on mortgages and credit cards. The federal reserve takes on average 4% per year out of our domestic economy doing this. Credit is a small portion of the banking system’s income.
But ripples in one method creates ripples in all the other methods. They are codependent on each other. Just look at the stock market and how much a 4% difference can make.
Even the huge big “too big to fail” pharm industry is a little worried because of their recent losses in the market. They need to get hit even harder by many more right now and they will back track.
Same with banking... Start with using cash only again. That would throw a wrench in the works. But... Folks are too lazy or in too much of a hurry to count out or carry cash. Our own pure laziness and convenience is our own worst enemy.
But rather than adapt and change lifestyles to stand on principle and fix it, we would rather have short term convenience and end up owning NOTHING. It is dumb as hell.