Github (aka Microsoft) should take notice -- Valve could be a big software player in the next decade.
"OSS dev payment pipelines / mentoring" is passé. Putting all their code into a LLM (of sorts) is not the way forward either. There's still a LOT of OS issues, and Valve seems to have surmounted a very large one, WITHOUT angering anyone.
Yet, it sounds like they've managed? Possibly because there's a clear road forward that people generally align on, though even then, disputes about things like code architecture can easily arise.
I'm sure there's history I'm missing, and Valve / Steam undoubtedly has flaws. But while good will can take a long time to build, god has it helped Valve here.
Not everyone loves them.
Everyone may go too far, but the majority seem to hold Valve in higher regard than nearly any other FAANG, Microsoft, and any other PC gaming storefront aside from GOG (from what I've seen).