Different operating systems mostly, All OSs have viruses / exploits, but some are better protected then others. Some are more common, etc… Virus hackers are usually doing it for a purpose (extort money, steal data, create bot-nets, etc) they will target the easiest ways to meet those goals.
Windows is by far the most common and easiest OS to hack (various reasons) Linux and Unix in general is more granular, users (at least on important systems) generally do not have the permissions needed to do things they are not allowed, Phones are generally based on Unix (I believe Iphone’s are based on BSD Unix and Android is based on Linux) There are other variations including some from scratch OSs but they are not all that common.
So Windows is historically more the more common platform as well as being easier to hack due to its legacy and decisions that MS made. hence is the low hanging fruit. Not to say there are not some nasty hacks on other OSs but by far it is windows that is the most insecure.
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