To be able to earn Microsoft rewards using the Pc, doing different tasks.

I personally don't think people need incentives to use PC or Windows 10. also it would be like bribing people. the reason why people use Windows and PC is because they NEED it. otherwise there are many Linux distros that are free and has been free for the past 30 years, but still you see linux's desktop share is less than 1%.
i think if Microsoft wants to make customers happy and attract even more people towards their ecosystem, they should make Windows better and more stable. build 1903 which is the latest one is a good start towards that direction.