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Build labs are infrastructure. You can't build iOS on a Linux machine, so at least some percentage of their infra is presumably Macs in racks.

I'm not 100% sure but I think that ios can be virtualise on standard x86.

Technically yes, but the licence forbids it

Not legally I don't think

Apple have weird T&Cs for running virtualisation software

Yes, but good luck getting a licence to do so.

Yep, as others have said we've got some Macs for building and testing on Apple platforms. Also Windows, but those are virtualized.

Nowadays a lot of the network gear runs Linux too. Cisco's IOS XE and NX-OS run on a Linux kernel as does Juniper's Junos Evolved. All of Arista's gear has been Linux based since day one.