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The cynical might note that somehow software development happened before modern version control systems, much less GitHub, even existed.

Not as public open source in such a wide scale and availability as today

Linux has been on Github for 9 years.

Linux has been for 29 years.

"in such a wide scale and availability as today"

Based on what trend data or measures?

I think it's a good idea to point out that github only mirrors Linux. The development happens over email.