It's not a one-off deal, support in Linux for example means you either need an unconstrained spec and third party maintainers, or having some person support it

It's not a one-off deal, support in Linux for example means you either need an unconstrained spec and third party maintainers, or having some person support it full time forever (or as long as the devices exist). Unmaintained code gets thrown out, that is why so few companies and projects do it; they are almost always a one-off with a short lifespan.