Oh, you make it sound so simple. A platform is an alternative to dominating ecosystems if it exists at all. It having apps, locking you into Microsfot, or even existing 5+ years down the road doesn't matter? If that's true, there should be all kinds of people on all kinds of smartphone platforms right now instead of most of them on two.

Meanwhile, Tizen is available for people wanting whatever their changing offering is. I guess just budget regular rewrites in a new language/platform you had to learn into your FOSS app on Tizen with either few contributors or the more common zero. That's some great ROI.