[mtgx]

Even without the point about more users wanting to replace Windows with a Linux distro, it makes harder to argue that "ATMs should run Linux instead of Windows", if Linux is falling behind in security. Also, ATMs should probably run OpenBSD.

[dfox]

Mainly, the PC inside ATM should not do anything remotely security critical. PC-based ATM platforms are actually designed around compartmentalization and in ideal case the PC should only draw UI on screen, handle some subset of input events and route encrypted messages between other components of the ATM (whether it's implemented in this way in actual deployments is another issue).