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It was never sustainable. They always paid out more than they could afford in order to facilitate growth. That's the real motivation for the demonetization controversy.

Im starting to enjoy Youtube less because of the ads - there seems to be more and more! I know you can pay for Youtube red to remove the ads - but cant bring myself to do that - but I guess its the same as Spotify you can use it for free but I pay to remove the ads and get the extra benefits.

Lets hope Dtube grows to compete in the long run

It's not broken. It's called competition. More players enter a market it will become more competitive to get value in return because more can produce the work. To compete you have to increase your output of value to the market place.