Newer versions of SW can open files created on older vesions without any problems; any version of SW can export all kinds of file formats readable by many other programs. I can't think of any serious 3D CAD software that is backward compatible. It would be nice if backward compatibility were offered, but it isn't a big deal. If you don't receive files from other sources, there is no need to update your software every year.
If you are involved in industrial production as a service company, then keeping your software up to date is a cost of doing business. Like rent and saleries.
Software companies don't like people robbing them for the same reason banks don't like people robbing them.