Today is the Day when YouTube demonetized small channels and creators. Generally if you want to make money on YT you will need to reach at least 4000 watch hours in the previous 12 months and 1000 subscriber to do so. So it's sad day for small creators and they basically saying you are not good enough to make us big money. I do not know the real reasons for this decision I do not think it can bring a good thing to YouTube community.
Good luck for all small video creators!