It does seem like the obvious efficient solution hypothetically. Right now we have proxies "Well he worked at FAANG so he's probably good enough for us" on the company side and glass-door (horribly subjective) on the individual side. But really no way for extremely-qualified individuals to say "show me all job offers within X miles that pay more than $y for position $z" (closest thing I'm aware of is indeed).

That said, for whatever reason the startups that tried to be intermediaries (and also various recruiters) tend not do very well in my experience.