Every time I see Apple flaunting Linux containers I can hardly consider it as anything but admitting defeat. It could easily be Darwin, if they still had the capacity.
What is the alternative? They gave up the server market a decade ago and before that they barely actually supported it.
If they were to support darwin containers, what would be the point? Literally nobody would build to it, Linux won.
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Apple set itself up for defeat in the server and developer marketplace as soon as they decided macOS was proprietary code.
Why would any serious developer use closed-source code they can't debug and modify? Especially for a production server?
It's the same reason no serious developers or hackers use macOS, like part of the point of being a developer is being able to dig into the code at any layer and debug and fix things.
Just change 30 years of internet history