Open Source did not win. In fact it destroyed a lot of potential markets. With this move Apple is dragging more and more developers that would be interested in Go/ Java (aka Android world) to its net.
Part of me says that any ecosystem that can be 'destroyed' by something as simple as near-zero-cost copying of product should never really have been a 'market' to begin with.
We don't hear a lot about the sunshine or oxygen markets.
I am strongly Anti-Apple biased and I fail to see how Apple Open Sourcing is a win only for Apple? This is a ligament proof of the power that Open Source has. Now the deal with Metal and its possible hurting of the Linux game market, since they will move away from OpenGL that is another story.
Apple is now going to use USB-C connectors and now Swift is available in Linux?
This is a win for Apple only.