Although I probably have my price, I too otherwise refuse to work for companies that'd force me to use windows. I've been lucky to be able to use macs since 20

Although I probably have my price, I too otherwise refuse to work for companies that'd force me to use windows. I've been lucky to be able to use macs since 2008 and some of those companies had linux users. Most top tech companies will happily give you a choice between a mac or windows. For me it has generally mean I don't work for banks, the government, or very large organizations that aren't recent tech companies. That being said, at a certain scale or type of company centralized management, software support, and security risks mean "allowing" random people to run their own OS becomes difficult and risky. Lots of large older companies probably have proprietary software, too (thankfully more of this is becoming web based). Yes, in theory linux is more secure and anybody who would want to use it is probably capable of taking care of themselves, but it is probably (at large companies) corporate lawyers and CISOs ruining the fun. And linux can have its own risks and dedicating a team to support (from a security perspective) them isn't economical for the what would be very small user base. Ye old big bank can't and arguably shouldn't allow it without an otherwise good reason.