Here's how I see the word "fiat" with re: software. Comes from Saifedean Ammous. "Fiat software" is software where you can't move your data to another provider of the solution. You can't move from Google Workplace to Google Workplace "by Oracle", for example. But you can move from Nextcloud from vendor A to Nextcloud from vendor B. It just so happens that there is a high overlap between non-fiat software and opensource. But this doesn't have to be the case.