content: it's just got such a small market share that malware writers don't really bother  Malware bothers Linux all the time, it has a small desktop market-share but it has a big presence in the server space and now it's in a significant number of Smartphones and IoT-devices through Android that security through obscurity isn't a thing with Linux anymore. It isn't such a problem due to the open-source model that makes the code be audited and patched constantly as well the fact that the common method of software acquisition is through curated public-repositories.