What if companies just open-sourced their code? Then a programmer could look at the very system they would be paid to work on and a company could look at exampl

What if companies just open-sourced their code? Then a programmer could look at the very system they would be paid to work on and a company could look at examples of real work. No more puzzles and arbitrary tasks. And if the system is of any interest and a community develops, that's a source of new programmers. The company gets access to a talent pool and hackers get to know if it's work they want to do. The obvious downside is that competitors get your code too. But is there any credible analysis or evidence of how bad a risk this is? Because the risk of not finding good programmers is pretty bad. I suspect that people are still way overestimating the value of source code in and of itself, relative to the value of the team that produces it. If so, that's a market inefficiency and open-source might provide an edge. It would also be more rational and satisfying from the point of view of the actual work. Imagine where mathematics would be if mathematicians still kept their proofs secret. Can anyone point to examples that shed light on the effect of open-source on hiring?