Even in this example it is a yes and no. Remove academic development in the AI, including the paths we left, and your examples would not have any AI at all.
The problem is a little bit more nuanced than that though. It is not that big companies do not make inventions. Often, these inventions do not survive politically in the behemoth. That is why some companies decide to create a spinoff, knowing that their own body would be trying to kill the growth of their offspring.
Even in the early days AI was heavily funded by the private sector. Symbolics machines were partly promoted as a way to do AI research, back in the logic era. And the AI winter was mostly a grant funding phenomenon. When it became unfashionable in universities the field rebranded as ML and became commercially driven by (mostly) different people. Companies like Google invested in advanced ML research from day one.
Nowadays it's been rebranded back to AI due to the switch to neural methods, but there's been funding for AI from the computer industry for as long as the field existed.
I'm pretty sure AI would exist as a field and be in a similar place to where it is now, even if governments had never funded it at all.
Even more, a significant portion of the researchers at industrial labs got their start as graduate students, largely funded by government grants. Even if somehow no actual fundamental research transferred from academia into industry, the people sure do.
The problem is a little bit more nuanced than that though. It is not that big companies do not make inventions. Often, these inventions do not survive politically in the behemoth. That is why some companies decide to create a spinoff, knowing that their own body would be trying to kill the growth of their offspring.