Anyway buying competitors has allowed Autodesk to shape the US AEC industry toward proprietary file formats such as Revit, while their low end product AutoCad Lite insures that small shops never automate and the construction design industry buys subscriptions in the hope that this year's features will actually effect the bottom line. They won't.
It's a great example of how to run a startup that creates a monopoly. They beat Adobe to the subscription model by more than a decade.
The Autodesk File is an excellent look inside its early days: https://www.fourmilab.ch/autofile/www/autofile.html