That is true. IBM literally outlived its competitors, though. It's somewhat sad to see this technology fading away due to greed. I wonder if the same is going

That is true. IBM literally outlived its competitors, though. It's somewhat sad to see this technology fading away due to greed. I wonder if the same is going to happen with newer companies, the software reinvented again. Had we have copyright lasting only for 20 years (like patents), it would be possible to legally run first version of z/OS today.