it's not that apple will sell server chips. it's that developers can locally work on arm which makes it easier to deploy to severs. linus torvalds had a quote about this...
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And the only way that changes is if you end up saying "look, you can deploy more cheaply on an ARM box, and here's the development box you can do your work on".
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It’s wild to consider that my next computer (an arm M1 Mac) will be compiling code for mobile (arm) and the cloud (arm). I wonder if we’ll ever see AMD releasing a competitive arm chip and joining the bandwagon.