Most of their points are valid for community driven open source projects but the existence of large corporate ones like Chrome, Android, .net, VS Code, Tensorflow and lots more prove that exerting tight central control while being fully open source is very much possible.
All of your examples are subsidized by a parent corporate sponsor that makes billions from something else. Chrome can be "free as in beer" and Chromium source can be "free as in libre" because Google/Alphabet make billions in ads from a search engine. It's easy for MS to release VSCode and .NET for free if billions are earned from MS Office, Windows, SQL Server, etc.
Wolfram doesn't have another product that rakes in billions such that any licensing income loss from hypothetically open sourcing Mathematica would be an insignificant rounding error.