It really depends on the position and the business. If you directly create value it’s pretty easy to make the ask, and they’ll probably say yes. Some businesses however are too burdened with vendor lock-in or lacking IT skills to make it happen.

I work for a marketing agency which has a mix of typical office roles (accounting, HR, sales) and industry specific positions (mostly creatives and developers). The former are normally used to Windows from previous jobs or school, and the exact opposite is true of the creative departments. So, choosing which platform each new hire prefers is standard for us (and has been for more than a decade).

I heard NASA does. If you have a speciality of a small group and the top person in your field used to using X you get X.