One of the reasons I could think of ads and viewing video is what makes them money, they want you to see ads but don't we also use youtube to listen to music and other audio-only contents? People will listen to ads as well. What do you guys think?
closed as primarily opinion-based by Andrew Martin, RobbyReindeer, locationunknown, Ken Mohnkern, jazZRo May 2 '18 at 8:00
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Google offers this exact thing in a paid service called YouTube Red. The only reason why it's not in the free app is to let Google and the content creators it licenses from make more money.