Less views means worse discovery. Basically, if they start to push their viewers to another platform, they'll be recommended less on YouTube. Like it or not, 99.999% of their potential viewers are only on YouTube, which means growth will stagnate. Worse than that, their videos will be shown less even to current subscribers so they'll lose income.
There really isn't a good solution that I can think of...
There really isn't a good solution that I can think of...