The phone OS market was already pretty entrenched when they started on Firefox OS. They're focusing on IoT now exactly to prevent it from ending up like Firefox

The phone OS market was already pretty entrenched when they started on Firefox OS. They're focusing on IoT now exactly to prevent it from ending up like Firefox OS, and to prevent them from ending up in a Firefox Desktop-like situation, where its relevancy keeps declining both because the relevance of desktop is declining, and because people do not use Firefox on mobile and thus cannot sync.