> Why is there no money to be made?

Not enough people care to use cut rate hardware that actually conforms to the 'wholly open' philosophy. Even Stallman couldn't maintain using fully open hardware. He had to switch to a Thinkpad with Coreboot.

People have expectations when using devices as complex as a phone or laptop to where, compared to even a desktop with Linux, having a smartphone that is fully open comes with serious drawbacks.

You could always get a LibrePhone or a Pinephone but you probably won't enjoy the experience.