Do you use Windows, macOS, iOS, Android? Have you seen the source code to any of these? And no, AOSP doesn't count. It's a fraction of the code running on consumer Android devices.
Don't get me wrong, I prefer open source solutions, but I'd more prefer a company focused on building privacy-first products and being able to fund themselves.
Their answer to this might simply be "no". There are people who just wont touch devices that are shipped with code / programs that don't respect the privacy of the user, unless installing free software to override the stock proprietary system is an option.
Um, yep, I see macOS and iOS advertising that all the time, not only through their mainstream TV ads, but also in recent years like every time I upgrade one of my family's Apple devices.
Yeah no. If I don't see source code then I'm not bitting.