Google stopped allowing their staff using Windows a decade ago (with very limited exceptions).
I presume Google have not relaxed that rule for Windows 10.
I presume Google have not relaxed that rule for Windows 10.
I asked them about this particular rule and they said they were allowed to use Windows but certain other engineers were not allowed to.
I came from the same understanding as you but my new understanding was that except for certain departments they are allowed to use Windows.
I have been thinking about using OpenBSD - but I am guessing that a secure OS is no help when you need to use insecure apps.