Android is the most Pervasive yes, but I would consider it too focused on a specific type of platform, and one that is becoming more and more closed off. Chrome

Android is the most Pervasive yes, but I would consider it too focused on a specific type of platform, and one that is becoming more and more closed off. ChromeOS might be a better example, but much like android, it is also very closed off from the rest of the ecosystem.