Same strategy as a Kindle, Fire TV or a Portal – a proprietary gateway to services they sell, probably sold at or below cost. It's in line with their work on ChatGPT voice mode and such.
Funnily enough Amazon did try making a subsidised smartphone with deep integration of their services and it was a disastrous flop. Kindle and Fire TV succeeded by not directly competing with smartphones, but rather complementing them by being good at things that smartphones can do but not well.
If OpenAI plans to fork Android into their own thing then I can't see it going any better than Amazon's attempt did, and if it's a wearable like Humane/Rabbit then it needs an answer to "why isn't this an app".
Kindle is good stuff though. On the other hand, I can't imagine what a dedicated device would bring to the table that a smartphone / tablet would not in this case...
It’s probably a wearable device and the most instant uncanny valley nerd alert device imaginable, that makes bluetools and google glass wearers seem almost normal.