I can't speak for other companies, but as a person involved in hiring, open source is very valuable to me. It's not valuable in terms of potential to market/us

I can't speak for other companies, but as a person involved in hiring, open source is very valuable to me. It's not valuable in terms of potential to market/usefulness/popularity, rather, because I can see very clearly how a person designs/writes code, and how they solve problems, when they have plenty of time; I can also see other non-technical aspects, like how they structure their git history (which, to me, has lot of signals). People (rightfully) dislikes to show their capacity under pressure; open source is the way to show it without pressure :)