Even looking at a world where training data, models, etc. are all public domain or otherwise free to use for commercial purposes, you will still see a huge numb

Even looking at a world where training data, models, etc. are all public domain or otherwise free to use for commercial purposes, you will still see a huge number of companies that specialize in AI "as-a-service" simply due to the size of the ML talent pool, the desire to mitigate risk and purchase a known quantity rather than "roll your own AI", and the nature of how new technology is implemented at scale. Edit: and if copyright laws strike down current AI models and require some kind of BOM with established 'rights' to the data used to train models, you'll just end up with some variant of a gray market for training data that allows big corporations to do what they want with whatever data they can get their hands on, delegating risk to middle-man brokers making access to trained models EVEN MORE restricted to highly funded ventures.