The one we're in where "software" doesn't just mean an app that someone downloads from a website or an app store. Software includes lots of server side components, etc, etc.
I once noticed my name in the Chromium OS credits due to a patch I had submitted to a library that's on every Chromebook. 1 million would be a small number for Chromebooks alone.
I'm not talking about the median piece of software with 2 users and 0.1 developers (I made that up).
The ones that stick out are actively maintained, widely used, and well funded. It doesn't have to be a million active users, but they should be the first to get their act together.