There's been a few articles today about a method to hack ATMs which have not had their default administrative passwords changed. This shouldn't be entirely surprising for a number of reasons. We already know some ATMs are also vulnerable to viruses and voting machines can be hacked, etc. Good security practices are good security practices regardless of the specific operating system being used. The hacking incidents mentioned above, in particular, are caused by the same basic conditions that have led to the prevalence of things like bots and password-stealers. In the case of the voting machines and password-stealers, important data kept unencrypted is easy to steal or manipulate. In the case of ATMs and bots, using easy-to-guess passwords makes it very easy to add or subtract things from your machine.

People seem to get lulled into complacency because their particular machine or operating system isn't in common usage, regardless of whether the OS is on a laptop/desktop machine or on another sort of device. Security through obscurity will only get you so far, especially when your device has something of monetary value on (or in) it.