The author talks about Koala but notes that ChatGPT is better. GPT-4 is then significantly better than GPT-3.5. If you've used all the models and can afford to spend money, you'd be insane to not use GPT-4 over all the other models.
Midjourney is more popular (from what I'm seeing) than Stable Diffusion at the moment because it's better at the moment. Midjourney is closed-source.
The point I'm wanting to make is that users will go to whoever has the best model. So, the winning strategy is whatever strategy allows your model to compound in quality faster and to continue to compound that growth in quality for longer.
Open source doesn't always win in producing better quality products.
Linux won in servers and supercomputing, but not in end user computing.
Open-source databases mostly won.
Chromium sorta won, but really Chrome.
Then in most other areas, closed-source has won.
So one takeaway might be that open-source will win in areas where the users are often software developers that can make improvements to the product they're using, and closed-source will win in other areas.