A large portion of which are using it in a feature phone capacity. Many only use smartphones because it’s what their carrier gave them after their old candybar dumbphone either broke or became unable to connect to cell towers.
The other groups are those who use it identically to how they would iOS (and don’t root or sideload), those that use it as computer replacement, and those who just like to tinker. Those last two groups are a tiny, tiny sliver relative to the others.