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They haven't used mac servers in more than a decade long before they discontinued Xserve.

How do you CI for iOS apps without a mac server?

I would guess you just use non-rackmount hardware to do it.

Nobody will sue them if they install macOS on a standard PC hardware, probably they use standard PC hardware to develop internally

> they use standard PC hardware to develop internally

For iOS development? Everyone uses Macs.

I had to look for a bit before I found an apple URL that wasn't behind Akamai (Linux), but:

Just says OS is 'unknown', Apache server. So they may possibly be using a version of Mac OS to host at least something.

This one is just showing up as Apple, definitely used to be Darwin but has also been Linux before.

I believe they use a lot of RHEL

doubtful