Are there any more examples like that? I think that possibly Valve is an exception rather than a prediction for the future - they're obviously an incredibly successful company, but I haven't heard about other large companies with similar model.

I know Github had kind of similar culture in the beginning, with flat hierarchy, but that changed at some point. Then there's Zappos which is famous for their holacratic approach, but earlier this year I've read some articles saying that internally they move away from that model.