They're presented as a hypothetical scary technology, not something that actually exists today. That framing is important to the conversation. The author is acting like there's a decision to be made. Pretending that open source models don't exist yet makes the decision artificially more difficult.
Why not examine the usage of existing models and judge them on their merits?
https://twitter.com/jeremyphoward/status/1678558165712113664
Whether it's a convincing argument is different question, but it's not for lack of knowledge about the state of art in AI.