GrapheneOS is a beautiful stop-gap, but there are real bona-fide Linux smartphones out there. To be clear, there are not many, the hardware often isn't great, the software often isn't great. PinePhone and Librem come to mind.
The final phase is "AI" monitoring everything you do on your devices. Eventually it won't just be passive, either, but likely active: able to change books you read and audio you listen to on-the-fly without your consent. It will be argued that this ok because the program is "objective".
For anyone else failing to resolve DNS for that domain: https://archive.is/q7w0x
And if what you want is a PDA that runs Linux, there are many options, e.g. https://www.clockworkpi.com/home-uconsole.
Android is decades ahead of that in security, functionality, utility, devex, and design. It's a fools errand to try and modernize that, over building on top of AOSP.