Way back when, MSFT would set up developer meetups and give everyone who showed up a free Windows phone for development. I still have a couple in a box somewhere. People would take them, but nobody wanted to make apps. Everybody was busy enough with iOS and Android.

MSFT even tried to pay companies to port their popular apps to Windows. A few took the money and did the port, but nobody wanted to support it.

Samsung was also trying to get people to write apps for their watches. Same issue. It’s really hard to break in if you’re entering an already crowded market.