GI1 If AI is starting to be integrated into iOS, Windows 12, Mac and Google I could easily envision it being added to AOSP in the future.
The difference between, on the one hand, iOS, macOS, Windows, and Google's Pixel OS, and, on the other hand, AOSP, is that the first group is proprietary closed-source operating systems, where as a user once you buy in the real decisions have been made and your choice is limited to picking among a few options chosen by somebody else.
That's just not how open-source projects work. If somebody -- Google, or, even hypothetically, the GrapheneOS developers, puts something in GrapheneOS that you don't like, you have the power to take it out. Since everybody has the power to take it out, even if you personally are not a coder, or are too busy, as long as a small number of cooperative people, even scattered across the planet, want to take it out, it will be taken out.
There will be some costs. One might give up access to Google's NFC payment merchant network. One might not have Android Auto. One might not have the fastest GPU, or access to every game. But if one's primary overarching goal, which is worth giving things up for, is an AI-free phone, and there are other people who share that goal, I think that will remain achievable for some time.
AI isn't going to force its way into your phone. At some point you might need to choose to have access to fewer games, or choose to accept GPS navigation without real-time traffic data, or choose to accept a two-year-old phone instead of this year's model, or even, perhaps, choose to have B-grade hardware security instead of A+, in order to get a phone without "integrated" AI controlled by a company you distrust. But if it ever happens that you are forced to buy an AI phone, it will not be soon.
Instead of expressing fears about corporate AI to people who have already chosen to distance themselves from corporate control (i.e., everybody on this forum), it is arguably more productive to show people who are still bought into corporate control how great GrapheneOS is.