Mark's article picked on Microsoft specifically because of its big swing in favor of open source in the last few years, saying that open source allowing free riding enables their bad behavior. Basically, open source "failed" because it didn't prevent corporations from being bad actors.
Now, I certainly have qualms with how Microsoft has gone about joining the open source movement, such as immediately buying its way onto the Linux Foundation board in light of its previous "Linux is evil" stance or "Embrace, Extend, Extinguish." The Linux Foundation's questionable history with conflicts of interest doesn't help, either. But the general idea of acknowledging that open source software is foundational to modern software is just being realistic about where we're at.
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