Making a positive income on youtube is incredibly difficult. The competition is very high, the pay is pretty subpar, and the hours are long. You also need to take a few (yes, a few, not a couple) years off of your day job to work entirely on content and marketing to get your channel off the ground.

A topic like chess might take 60 hours a week of video editing over the course of years just to get to 4k/month in income IF you beat the nearest 10,000 competitors who are trying to make similar channels.

Really not a realistic option for most people.