Autodesk was only an illustrative example, Solidworks and Onshape have similar price tags. Professional software outside of software development is highly specialized and very expensive. There wont be any open source equivalents for most of them for a very long time if ever. “You shouldn’t use proprietary software”, is easy to say when alternatives exists; but currently we don’t even have an FOSS alternative to Photoshop that creative workers are willing to use.