The more I think about this and based on the really good answers to my silly question it feels like there is a giant gap here.
Feels... It feels like there should be a universally open source, royalty free sans-like and monospace-like font that has been optimized for screen readers for vision impaired as well as developers to spend hours/days coding in and contributed to the internet for all devices to use. I have no evidence to back this up, it's just a feeling.
Not a font to download or embed but rather a set of fonts that is already embedded in all the things so anyone could just reference it. So in CSS something like:
font-family:open-free-monospace
font-family:open-free-serif
Rather than providing a URL to download the fonts, everything already has the fonts preinstalled. OS, IoT, toasters, cars, phones. All the things. Surely there must be a set of highly artistic altruistic people that might wish to contribute such a thing to humanity.