I do not own a cell phone, but I build my operating systems from 386 bytes of machine code all the way up to dual hardware anchored remotely attestable servers with memory encryption and hardware anchored disk encryption, and can do whatever I want on them with confidence.
I even rack my own GPUs at home and own my own AI and "Cloud" too for less than the price of a used car.
The motivated and technical can do virtually anything with tech with total sovereignty and privacy. It has never been easier.