What "begins"? There's been several Unity AI companies come and gone already, including some mergers and acquisitions. [1] comes to mind.

Epic jumped on the AI bandwagon a while ago.

Unity has been the laggard in terms of AI adoption. If anything this is an "ending" to their old ways.

[1] https://www.tryaura.dev/

True that there has been many companies with their own implementations but I feel like a native implementation done by unity will have a huge effect. There is just so many indie devs using it, when the unity team starts adopting it more like how they have started with this cli, I think the use of AI in game development will skyrocket