you can always get in on the action by building a more efficient and simpler modelExcept the big 5 have hoovered up a good portion of the ML talent from the universities and are themselves leading the pack in iterative improvement on ML capabilities.
If you are trying to bootstrap a ML company with the trickle of raw data that the big 5 puts out, you're not going to ever get to their size.
This is not about being able to create a 300k/yr company off the back of some table scraps. It's about major companies having too much influence over one market.